What does the idiom "A fish out of water" mean?

A fish out of water
English Meaning: someone who is uncomfortable in a specific situation.
Bangla Meaning: অস্বস্তিকর অবস্থা / বেকায়দা অবস্থা

Hence, the meaning of the idiom "A fish out of water" is - Someone who is out of place and uncomfortable.

Ex. Sentence: I felt like a fish out of water at my new school.
Bangla Meaning: আমি আমার নতুন স্কুলে খুব অস্বস্তিতে ছিলাম।

Source: Lecture.