rear end

the part of the body upon which someone sits the mother swatted her toddler lightly on his diapered rear end to get his attention 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, buttocks, rump, seat, tail, tail end, tush [slang]Related Words beam, stern; moon [slang]