a fish out of water
US /ə fɪʃ aʊt əv ˈwɔtər/
UK /ə fɪʃ aʊt əv ˈwɔtər/

1.
离水的鱼, 格格不入
a person who is in an unfamiliar or uncomfortable environment
:
•
When I moved to the big city, I felt like a fish out of water.
当我搬到大城市时,我感觉自己像一条离水的鱼。
•
He was clearly a fish out of water at the formal dinner party.
在正式晚宴上,他显然像一条离水的鱼。