backsiden.

英 bæk'saɪd; 'bæksaɪd | 美 'bæksaɪd

中文n. 背部；后方；臀部

词根词源

backside (n.)c. 1400, from back (adj.) + side (n.). In the specific sense of "rump, buttocks" it is first recorded c. 1500.

关键词

backside