Jisho

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Expressions (phrases, clauses, etc.), Godan verb with 'mu' ending
1. to get the hang of; to learn the secret toUsually written using kana alone
Other forms
こつを掴む 【こつをつかむ】骨を掴む 【こつをつかむ】
Notes
骨を掴む: Rarely-used kanji form.

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