Jisho

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Expressions (phrases, clauses, etc.), Godan verb with mu ending
1. to choke up; to be speechlessIdiomatic expression
Expressions (phrases, clauses, etc.), Godan verb with mu ending
2. to hold one's tongueIdiomatic expression
Other forms
声を吞む 【こえをのむ】声をのむ 【こえをのむ】声を飲む 【こえをのむ】
Notes
声を飲む: Irregular kanji usage.

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