Jisho

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Godan verb with 'mu' ending, Transitive verb
1. to hum (a tune); to sing to oneself; to croon
Other forms
口遊む 【くちずさむ】口吟む 【くちずさむ】
Notes
口遊む: Rarely-used kanji form. 口吟む: Rarely-used kanji form.

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