Definition of BREECH

the part of the body upon which someone sits <plant yourselves on your breeches on that bench and listen to what I have to say>
Synonyms backside, behind, booty (also bootie) [slang], bottom, breech, bum, buns, butt, caboose, can, cheeks, derriere (or derrière), duff, fanny, fundament, hams, haunches, heinie [slang], hunkers, keister (also keester) [slang], nates, posterior, rear, rear end, rump, seat, tail, tail end, tush [slang]
Related Words beam, stern; moon [slang]
breeches pl  an outer garment covering each leg separately from waist to ankle <the mounted riders look striking in their red coats and white breeches>

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