noun
pent-up anger; lingering resentment
Refers to anger or resentment that remains after an event, often unexpressed or unresolved.
彼は余憤を晴らすために手紙を書いた。
He wrote a letter to vent his pent-up anger.
会議の後も余憤が収まらなかった。
Even after the meeting, his lingering resentment did not subside.