What does "thumb" mean?
The shortest and thickest digit of the hand that for humans has the most mobility and can be made to oppose (moved to touch) all of the other fingers.
Thumb
/θʌm/ name, noun, verb, slang
name, noun, verb, slang ·Common ·High school level
Meaning at a glance
- Primary sense: The shortest and thickest digit of the hand that for humans has the most mobility and can be made to oppose (moved to touch) all of the other fingers.
- Grammar: thumb is listed as name, noun, verb, slang.
- Nearest alternatives: pollex, accept, all thumbs, annulary.
- Useful contrasts: big, disapproval, drive oneself.
- Usage evidence: The glove has a hole in the thumb.
How to use "thumb"
- Start with the primary definition, then check the part of speech before placing the word in a sentence.
- Compare nearby synonyms to make sure "thumb" 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 "thumb" 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 "thumb" as the right word for your sentence.
If your draft is formal, technical, persuasive, or sensitive, compare "thumb" 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 "thumb" is acting as 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 "pollex" 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 "thumb", 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 shortest and thickest digit of the hand that for humans has the most mobility and can be made to oppose (moved to touch) all of the other fingers.
- 2 a convex molding having a cross section in the form of a quarter of a circle or of an ellipse wordnet
- 3 The part of a slider that may be moved linearly along the slider.
"a scroll-bar thumb"
- 4 the part of a glove that provides a covering for the thumb wordnet
- 5 A thumbnail picture. Internet, colloquial
Show 2 more definitions
- 6 the thick short innermost digit of the forelimb wordnet
- 7 A top hatch plate for covering an excavator bucket, used to keep material in the digger bucket after scooping it up, and not letting it spill out.
Verb
- 1 To touch or cover with the thumb. transitive
"to thumb the touch-hole of a cannon"
- 2 feel or handle with the fingers wordnet
- 3 To turn the pages of (a book) in order to read it cursorily. transitive
"thumb through"
- 4 travel by getting free rides from motorists wordnet
- 5 To gesture with the thumb, for example when flagging a ride.
"Oh, look! There’s a car coming! Thumb-no, wave. They probably don’t understand thumbing."
Show 5 more definitions
- 6 look through a book or other written material wordnet
- 7 To hitchhike.
"So I started thumbin' back east, toward my hometown."
- 8 To soil or wear with the thumb or the fingers; to soil, or wear out, by frequent handling.
"He gravely informed the enemy that all his cards had been thumbed to pieces, and begged them to let him have a few more packs."
- 9 To manipulate (an object) with the thumb; especially, to pull back the hammer or open the cylinder of a revolver.
"Fargo palmed out his own revolver, thumbing back the hammer as the barrel came up."
- 10 To fire (a single action revolver) quickly by pulling the hammer while keeping the trigger depressed.
"To thumb a single-action revolver, hold down the trigger and use the thumb on the same hand to fire the gun by manipulating the hammer."
Proper Noun
- 1 The eastern part of the Lower Peninsula of Michigan, United States (the "Mitten"). informal
"Turnip Rock is located in a portion of eastern Michigan dubbed the Thumb, where 140 miles of coastline and waterfront towns offer a variety of outdoor activities, including biking, walking and kayaking."
Synonyms
All synonymsAntonyms
Example
"The glove has a hole in the thumb."
Common questions
What is a synonym for "thumb"?
Common synonyms include: pollex, accept, all thumbs, annulary, approval gesture, approve of.
How do you use "thumb" in a sentence?
The glove has a hole in the thumb.
How do you pronounce "thumb"?
Pronounced /θʌm/.
Etymology
Etymology 1
Derived from Middle English thombe, thoume, thoumbe, from Old English þūma, from Proto-West Germanic *þūmō, from Proto-Germanic *þūmô from Proto-Indo-European *tūm- (“to grow”). See also West Frisian tomme, Dutch duim, Low German Duum, German Daumen, Danish tomme, Swedish tumme; also Welsh tyfu (“to grow”), Latin tumēre (“to swell”), Lithuanian tumėti (“to thicken, clot”), Ancient Greek τύμβος (túmbos, “burial mound”), Avestan 𐬀𐬨𐬏𐬙 (amūt, “strong”), Sanskrit तुम्र (túmra, “strong, thick”). The parasitic ‐b has existed since the late 13th century.
Etymology 2
From its thumb-like shape.