/ ˈləʊkəʊ; NAmE ˈloʊkoʊ/ noun , adjective
■ noun
( pl. -os ) ( informal ) = locomotive
—see also in loco parentis
■ adjective
[ not before noun ] ( slang , especially NAmE ) crazy
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WORD ORIGIN
noun mid 19th cent.: abbreviation.
adjective late 19th cent.: from Spanish , insane .