Jisho

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Godan verb with ru ending, intransitive verb
1. to rot; to go bad; to decay; to spoil; to fester; to decompose; to turn sour (e.g. milk)
2. to corrode; to weather; to crumble
3. to become useless; to blunt; to weaken (from lack of practice)
4. to become depraved; to be degenerate; to be morally bankrupt; to be corrupt
5. to be depressed; to be dispirited; to feel discouraged; to feel downSee also 気が腐る きがくさる
Auxiliary verb, Godan verb with ru ending
6. to have the audacity to; to be bastard enough toUsually written using kana alone, Kansai dialect, See also やがる, after the -masu stem of a verb; indicates scorn or disdain for another's action
Godan verb with ru ending, intransitive verb
7. to lose a betArchaism
8. to be drenched; to become sopping wetArchaism

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