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.

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Origin of loco

1835–45, Americanism;<Spanish: insane
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

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