What does "loco" mean?
A certain species of Astragalus or Oxytropis, capable of causing locoism.
Loco
adj, adv, noun, verb, slang
adj, adv, noun, verb, slang ·2 syllables ·Common ·High school level
Meaning at a glance
- Primary sense: A certain species of Astragalus or Oxytropis, capable of causing locoism.
- Grammar: loco is listed as adj, adv, noun, verb, slang.
- Nearest alternatives: nutty, abnormal, anthrax, around the bend.
- Useful contrasts: calm, conventional, in place itself.
- Usage evidence: Some take their role as in loco parentis a little too far.
How to use "loco"
- Start with the primary definition, then check the part of speech before placing the word in a sentence.
- Compare nearby synonyms to make sure "loco" 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 "loco" 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 "loco" as the right word for your sentence.
If your draft is formal, technical, persuasive, or sensitive, compare "loco" 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 "loco" is acting as adj, adv, 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 "nutty" 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 "loco", 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 A certain species of Astragalus or Oxytropis, capable of causing locoism.
- 2 A locomotive. informal
"A locomotive is, next to a marine engine, the most sensitive thing man ever made; and No. .007, besides being sensitive, was new. The red paint was hardly dry on his spotless bumper-bar, his headlight shone like a fireman’s helmet, and his cab might have been a hard-wood-finish parlour. They had run him into the round-house after his trial—he had said good-bye to his best friend in the shops, the overhead travelling-crane—the big world was just outside; and the other locos were taking stock of him."
Verb
- 1 To poison with the loco plant; to affect with locoism. transitive
- 2 To render insane. broadly, colloquial, transitive
"They say that he is locoed. The insane asylums of California contain many shepherds."
Adjective
- 1 Crazy. colloquial
"It's Cottontail Smith, and he's gone plumb loco!"
- 2 Intoxicated by eating locoweed. Southwestern, US
Adjective
- 1 informal or slang terms for mentally irregular wordnet
Adverb
- 1 A direction in written or printed music to be returning to the proper pitch after having played an octave higher or lower. not-comparable
Antonyms
Example
"Some take their role as in loco parentis a little too far."
Common questions
What is a synonym for "loco"?
Common synonyms include: nutty, abnormal, anthrax, around the bend, balmy, barmy.
How do you use "loco" in a sentence?
Some take their role as in loco parentis a little too far.
Etymology
Etymology 1
From Italian.
Etymology 2
From Spanish loco (“insane, crazy; loose”).
Etymology 3
Clipping of locomotive.