身から出た錆
Meanings
1
suffering the consequences of one's own actions; reaping what you sow; paying for one's mistakes
Idiomatic expression meaning that one's own misdeeds or faults come back to cause trouble, like rust (錆) emerging from within. Often used when someone faces a problem they themselves caused.
His failure is the result of his own actions.
It was his own fault, so no one sympathized with him.