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Denshi Jisho — Online Japanese dictionary

黙り だんまり 1: silence; without giving notice; taciturnity; refusing explanation;
2: pantomime (in kabuki)
Noun 
黙りこむ だまりこむ to say no more; to sink into silence
Godan verb with mu ending, Intransitive verb 
黙り込む だまりこむ to say no more; to sink into silence
Godan verb with mu ending, Intransitive verb 
黙りこくる だまりこくる to keep silent
Godan verb with ru ending, Intransitive verb 

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