まな板の上の鯉
Meanings
1
someone doomed to their fate; fish on the chopping board (lit.)
Idiomatic expression describing a person who has no control over their situation and is resigned to whatever happens, like a carp on a cutting board awaiting the knife.
Like a fish on the chopping board, he could only wait for the outcome.
Before the exam, I feel like a carp on the cutting board.