backside[noun]Synonyms: buttocks, behind, bottom, derriere, fanny, heinie (
or hiney), posterior, rear, rump, seat
[TahlilGaran] English Synonym Dictionary ▲
back‧side /ˈbæksaɪd/
noun [countable] informal1. the part of your body that you sit on
Synonym : bottom2. get off your backside to start doing something or taking action, instead of not doing anything
⇒
be a pain in the backside at
pain1(3)
[TahlilGaran] Dictionary of Contemporary English ▲