This is the 860th most frequent Catalan word.
peix
Fish.
In this sentence, 'peix' is used as a common noun referring to fish (food) in general.
He comprat peix fresc al mercat.
I bought fresh fish at the market.
Here, 'peixos' is used in its plural form to indicate living fish present in a river.
Aquest riu està ple de peixos.
This river is full of fishes.
In this context, 'peix' is used within an idiomatic expression, symbolizing someone feeling out of place.