loco

[ loh-koh ]
See synonyms for loco on Thesaurus.com
noun,plural lo·cos.
  1. Slang. an insane person; maniac.

  1. Veterinary Pathology. locoism.

verb (used with object),lo·coed, lo·co·ing.
  1. to poison with locoweed.

  2. Slang. to cause to be insane or crazy.

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

Origin of loco

1
1835–45, Americanism;<Spanish: insane

Words Nearby loco

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024

How to use loco in a sentence

  • Mastrius (loco jam citato) tenet inseminationem esse necessariam.

  • There is a very real sense in which the crowd stands to his emotional life in loco parentis.

    The Behavior of Crowds | Everett Dean Martin
  • In another connection I have referred to the fact that the crowd stands to the member in loco parentis.

    The Behavior of Crowds | Everett Dean Martin

British Dictionary definitions for loco (1 of 3)

loco1

/ (ˈləʊkəʊ) /


noun
  1. informal short for locomotive

British Dictionary definitions for loco (2 of 3)

loco2

/ (ˈləʊkəʊ) /


adjective
  1. slang, mainly US insane

  2. (of an animal) affected with loco disease

nounplural -cos
  1. short for locoweed

verb(tr)
  1. to poison with locoweed

  2. US slang to make insane

Origin of loco

2
C19: via Mexican Spanish from Spanish: crazy

British Dictionary definitions for loco (3 of 3)

loco3

/ (ˈləʊkəʊ) /


adjective
  1. 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 place: loco Bristol; a loco price

Origin of loco

3
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