思い込む， 思いこむ， おもいこむ
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 abou...
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彼女は彼が無罪だと思い込んでいる。
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She presumes him to be innocent.
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彼女は私が彼女の悪口を言っていると思いこんでしまった。
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She got it into her head that I was bad-mouthing her.
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彼は自分が病人だと思い込んでいる。
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He fancies himself ill.
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彼は、彼女が幸せだと思いこんでいた。
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He took it for granted that she was happy.
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彼が僕にそう思い込ませたのです。
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He put the idea into my head.
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私は彼女が病気だと思い込まされた。
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I was given to understand that she was ill.
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今日車はとても普及しているので、私達は誰でも車を持っていると思い込んでいる。
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Today cars are so popular that we assume everyone has one.
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「どうした、その鼻？」「車をバックする時に後ろを確認しようとしたんだが、窓が開いてると思い込んで顔を窓にぶつけたんだ！」
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"What happened to your nose?" "When I was backing my car up I went to check behind me, convinced that the car window was open, and bashed my face into it!"
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