鬱うっ憤ぷん晴ばらし

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Meanings

1

venting pent-up anger; letting off steam

Refers to the act of releasing accumulated frustration or anger, often through some outlet like complaining, exercise, or a hobby.

I let off steam by singing karaoke.

彼かれはゲームで鬱うっ憤ぷん晴ばらしをしている。

He vents his frustration by playing video games.

ストレス発はっ散さん
ストレス発散 is a broader term for stress relief, while 鬱憤晴らし specifically implies releasing pent-up anger or resentment.
八やつ当あたり
八つ当たり means taking out one's anger on someone or something unrelated, whereas 鬱憤晴らし is a more general venting that may not involve a target.

鬱うっ憤ぷん晴ばらし
Standard kanji spelling; 鬱憤 is a common compound for pent-up anger/frustration.
うっぷん晴ばらし
Mixed kana-kanji spelling; 鬱 is complex, so うっぷん is often written in kana.

Compound of 鬱憤 (pent-up anger) and 晴らし (clearing, dispelling), the noun form of 晴らす (to dispel).