Meaning & use
Loco
Last updated
Crazy or insane; behaving in an irrational or wild manner.
See it in a sentence
He went completely loco when he heard the news.
Don't drive so fast, are you loco?
A note on using this word
Loco was borrowed directly from Spanish, where it also means 'crazy'; it entered informal American English in the 19th century.
Words with a similar meaning
Choose a synonym to suit the sentence. Meanings can overlap without being identical.
Words with an opposite meaning
sanerational
Another way to use it
2. noun
A locomotive, especially in railway slang.
The engineer eased the loco slowly out of the yard.
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