backside
US
UK backside n: informal (buttocks) (非正式用语)
SC 屁股，臀部 pì gǔ，tún bù
TC 屁股
TC 屁股
I slipped on the ice today and landed right on my backside.
tan [sb]'s behind, tan [sb]'s backside vtr: figurative, slang (whip, beat)
SC 狠狠揍…一顿
SC 痛打…一顿
Polly's father said he'd tan her backside if she was late home again.