1.
buttocks, bottom
The posterior part of the body that one sits on.
椅子に座りすぎて尻が痛い。
My bottom hurts from sitting in a chair too long.
赤ちゃんのお尻を拭いてあげた。
I wiped the baby's bottom.
お尻 is the polite form
彼は尻が軽くて、すぐに転職する。
He's restless and changes jobs quickly.
尻が軽い = restless, fickle
2.
rear end, back part
The back or trailing part of something.
列の尻に並んだ。
I lined up at the back of the queue.
スカートの尻のほうにシミがついている。
There's a stain on the back part of the skirt.
靴の尻がすり減って、新しいのを買わなければならない。
The heels of my shoes are worn down, so I need to buy new ones.
Can be considered slightly crude in formal contexts. Alternative polite forms exist.
COMMON EXPRESSIONS:
- 尻が重い - reluctant to get up/act, slow to start
- 尻が軽い - restless, fickle, doesn't stay in one place
- 尻に敷かれる - to be henpecked (lit. to be sat on)
- 尻に火がつく - to have a fire under one's seat (to be in a desperate hurry)
- 尻尾を出す - to show one's true colors (lit. to show one's tail)
POLITE ALTERNATIVES:
- お尻 (polite form)
- 臀部 (medical/formal term)