Jisho

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Godan verb with mu ending, intransitive verb
1. to be convinced (that); to be under the impression (that); to feel sure (that); to assume (that)
2. to make up one's mind; to set one's heart on; to be determined (to do); to be bent on
3. to be obsessed (with a thought, idea, etc.); to think about obsessively
Other forms
思いこむ 【おもいこむ】

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