Jisho

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Godan verb with 'mu' ending, Intransitive verb
1. to slip into (a place) for the purposes of having sex (e.g. a lover's house, hotel, red light district); to shack up withUsually written using kana alone
Godan verb with 'mu' ending, Intransitive verb
2. to shut oneself away at home (due to lack of money)Usually written using kana alone

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