/ rəʊtʃ; NAmE roʊtʃ/ noun
1.
( NAmE , informal ) = cockroach :
The apartments were infested with rats and roaches.
2.
( pl. roach ) a small European freshwater fish
3.
( slang ) the end part of a cigarette containing marijuana
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WORD ORIGIN
sense 2 Middle English : from Old French roche , of unknown ultimate origin.