loco

[ loh-koh ]
/ ˈloʊ koʊ /

noun, plural lo·cos.

Slang. an insane person; maniac.
Veterinary Pathology. locoism.

verb (used with object), lo·coed, lo·co·ing.

to poison with locoweed.
Slang. to cause to be insane or crazy.

adjective

Slang. out of one's mind; insane; crazy.

QUIZZES

LEARN THE SPANISH WORDS FOR THESE COMMON ANIMALS!

Are you learning Spanish? Or do you just have an interest in foreign languages? Either way, this quiz on Spanish words for animals is for you.
Question 1 of 13
How do you say “cat” 🐈 in Spanish?

Origin of loco

1835–45, Americanism;<Spanish: insane
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

Example sentences from the Web for loco

British Dictionary definitions for loco (1 of 3)

loco1
/ (ˈləʊkəʊ) /

noun

informal short for locomotive

British Dictionary definitions for loco (2 of 3)

loco2
/ (ˈləʊkəʊ) /

adjective

slang, mainly US insane
(of an animal) affected with loco disease

noun plural -cos

short for locoweed

verb (tr)

to poison with locoweed
US slang to make insane

Word Origin for loco

C19: via Mexican Spanish from Spanish: crazy

British Dictionary definitions for loco (3 of 3)

loco3
/ (ˈləʊkəʊ) /

adjective

denoting a price for goods, esp goods to be exported, that are in a place specified or known, the buyer being responsible for all transport charges from that placeloco Bristol; a loco price

Word Origin for loco

C20: from Latin locō from a place
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012