What does "arm" mean?
The portion of the upper human appendage, from the shoulder to the wrist and sometimes including the hand.
Arm
/ɑːm/ adj, name, noun, verb, slang
adj, name, noun, verb, slang ·Very common ·Middle school level
Meaning at a glance
- Primary sense: The portion of the upper human appendage, from the shoulder to the wrist and sometimes including the hand.
- Grammar: arm is listed as adj, name, noun, verb, slang.
- Nearest alternatives: branch, limb, weapon, accouter.
- Useful contrasts: demilitarized, unequipped, center.
- Usage evidence: I've got mosquito bites all over my arm.
How to use "arm"
- Start with the primary definition, then check the part of speech before placing the word in a sentence.
- Compare nearby synonyms to make sure "arm" carries the exact meaning, tone, and strength you need.
- Use the example sentence as a context check. If your sentence uses the word differently, confirm that the grammar still fits.
Meaning check
- Does the word fit the sentence's grammar?
- Does it match the intended tone rather than only the dictionary definition?
- Would a simpler synonym be clearer for the reader?
- Is there enough surrounding context to prevent ambiguity?
Source and review context
This entry combines structured lexical data with WordToolSet review checks. Definitions, examples, synonyms, and usage notes may come from different source tables, so the page is designed to show evidence from more than one angle before you rely on "arm" in a final draft.
If a word has several senses, prefer the sense that matches your sentence's grammar and surrounding context. A correct definition can still be the wrong choice when the sentence needs a different register, emphasis, or level of specificity.
Before you rely on this definition
Read the first definition as a starting point, then check the example, synonyms, and part of speech before treating "arm" as the right word for your sentence.
If your draft is formal, technical, persuasive, or sensitive, compare "arm" with a nearby alternative so the final choice matches both meaning and reader expectation.
Compare nearby meanings
- Use synonyms when you need a softer, stronger, simpler, or more specific word.
- Use antonyms to check the boundary of the meaning and avoid accidental contrast.
- Use the example sentence to confirm the word behaves naturally in context.
- Keep the original wording when a replacement adds complexity without improving precision.
Definition decision workflow
1. Identify the role
Check whether "arm" is acting as adj, name, noun, verb, slang in your sentence. A definition is only useful when the grammar matches the way the word is being used.
2. Test the nearest option
Compare it with "branch" and other nearby choices to see whether the sentence needs a softer, stronger, or more familiar word.
3. Confirm with context
Use the example sentence below as an evidence check, then read your own sentence out loud to catch tone or rhythm problems.
Review note: Definition pages are checked for source coverage, sentence evidence, synonym support, and editorial insight before they are treated as approval-ready pages. If the evidence is too thin, the page remains available to users but is kept out of the approval-facing indexed inventory.
Final meaning check
Before publishing a sentence with "arm", ask whether the word helps the reader understand the idea faster. A precise word should reduce confusion, not simply make the sentence look more polished.
When the definition, synonym evidence, and example context point in the same direction, the word is usually a safer choice. When they conflict, revise the sentence or choose a clearer alternative.
Definitions
Noun
- 1 The portion of the upper human appendage, from the shoulder to the wrist and sometimes including the hand.
"She stood with her right arm extended and her palm forward to indicate “Stop!”"
- 2 A weapon. usually
"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
- 3 Initialism of accelerated reply mail, a service of the United States Postal Service. abbreviation, alt-of, countable, initialism, uncountable
- 4 the part of an armchair or sofa that supports the elbow and forearm of a seated person wordnet
- 5 The extended portion of the upper limb, from the shoulder to the elbow.
"The arm and forearm are parts of the upper limb in the human body."
Show 17 more definitions
- 6 Heraldic bearings or insignia. in-plural
"The Duke's arms were a sable gryphon rampant on an argent field."
- 7 Initialism of adjustable rate mortgage. abbreviation, alt-of, countable, initialism, uncountable
- 8 any projection that is thought to resemble a human arm wordnet
- 9 A limb, or locomotive or prehensile organ, of an invertebrate animal.
"the arms of an octopus"
- 10 War; hostilities; deeds or exploits of war. in-plural, obsolete
- 11 the part of a garment that is attached at the armhole and that provides a cloth covering for the arm wordnet
- 12 The part of a piece of clothing that covers the arm.
"[…] one arm of this jacket streamed behind him like the broidered arm of a huzzar’s surcoat."
- 13 any instrument or instrumentality used in fighting or hunting wordnet
- 14 A long, narrow, more or less rigid part of an object extending from the main part or centre of the object, such as the armrest of an armchair, a crane, a pair of spectacles or a pair of compasses.
"The robot arm reached out and placed the part on the assembly line."
- 15 a human limb; technically the part of the superior limb between the shoulder and the elbow but commonly used to refer to the whole superior limb wordnet
- 16 A bay or inlet off a main body of water.
"Shelburne Bay is an arm of Lake Champlain."
- 17 a division of some larger or more complex organization wordnet
- 18 A branch of an organization.
"the cavalry arm of the military service"
- 19 Power; might; strength; support. figuratively
"the arm of the law"
- 20 A pitcher slang
"The team needs to sign another arm in the offseason."
- 21 One of the two parts of a chromosome.
- 22 A group of patients in a medical trial.
Verb
- 1 To take by the arm; to take up in one's arms. obsolete
"And make him with our pikes and partisans / A grave: come, arm him."
- 2 To supply with armour or (later especially) weapons. transitive
"The king armed his knights with swords and shields."
- 3 prepare oneself for a military confrontation wordnet
- 4 To supply with the equipment, knowledge, authority, or other tools needed for a particular task; to furnish with capability; to equip. figuratively, transitive
"thou getteſt no more of me. For I am ſure thy Office doth not arme thee with ſuch authoritie."
- 5 supply with arms wordnet
Show 5 more definitions
- 6 To prepare (a tool, weapon, or system) for action; to activate. transitive
"Remember to arm the alarm system before leaving for work."
- 7 To become prepared for action; to activate. intransitive
"Torpedoes were loosed, but the range was too short for them to actually arm, and they bounced harmlessly off the ship as it cut loose with its secondary and antiaircraft guns, smashing anything that it could see."
- 8 To cover or furnish with a plate, or with whatever will add strength, force, security, or efficiency. transitive
"to arm the hilt of a sword; to arm a hook in angling"
- 9 To take up weapons; to arm oneself. intransitive
"The sergeant sent out an order to arm the team for the next mission."
- 10 To fit (a magnet) with an armature. transitive
Adjective
- 1 Poor; lacking in riches or wealth. Scotland, UK, dialectal
- 2 Abbreviation of Armenian. abbreviation, alt-of
- 3 To be pitied; pitiful; wretched. Scotland, UK, dialectal
Proper Noun
- 1 Initialism of Acorn RISC Machine or Advanced RISC Machine. abbreviation, alt-of, initialism
- 2 Initialism of Australian Republic Movement. abbreviation, alt-of, initialism
Antonyms
Example
"I've got mosquito bites all over my arm."
Common questions
What is a synonym for "arm"?
Common synonyms include: branch, limb, weapon, accouter, accoutred, advocate.
How do you use "arm" in a sentence?
I've got mosquito bites all over my arm.
How do you pronounce "arm"?
Pronounced /ɑːm/.
Etymology
Etymology 1
From Middle English arm, from Old English earm (Anglian arm), from Proto-West Germanic *arm, from Proto-Germanic *armaz (“arm”), from Proto-Indo-European *h₂(e)rmos (“a fitting, joint; arm, forequarter”), a suffixed form of *h₂er- (“to join, fit together”). Cognates Akin to Dutch arm, German Arm, Yiddish אָרעם (orem), Danish, Norwegian and Swedish arm. Indo-European cognates include Latin armus (“the uppermost part of the arm, shoulder”), Bulgarian рамо (ramo), Polish ramię, Serbo-Croatian rȁme, Armenian արմունկ (armunk, “elbow”), Ancient Greek ἁρμός (harmós, “joint, shoulder”) and ἅρμα (hárma, “wagon, chariot”), Avestan 𐬀𐬭𐬨𐬀 (arma), Old Persian [script needed] (arma).
Etymology 2
From Middle English arm (“poor, wretched”), from Old English earm (“poor, miserable, pitiful, wretched”), from Proto-West Germanic *arm, from Proto-Germanic *armaz (“poor”), from Proto-Indo-European *h₁erm- (“poor, ill”). Cognates Akin to Dutch arm (“poor”), German arm (“poor”), Yiddish אָרעם (orem, “poor”), Swedish arm (“poor”).
Etymology 3
Back-formation from arms (plural), from Middle English armes, from Old French armes, from Latin arma (“weapons”), from Proto-Indo-European *h₂er-mo-, a suffixed form of *h₂er- (“to fit together”), hence ultimately cognate with etymology 1.