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思い込んで

be convinced (that), assume (that)

→ 思い込む
思い think; believe + 込ん into, deeply + で Te-form (conjunctive)
verb Rare #39,942
be convinced (that), assume (that) Often suggests a strong belief that may be mistaken.
JA: 彼はこの道が近道だと思い込んで、歩き続けた。
EN: He was convinced this was a shortcut, so he kept walking.

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。

Cars are so common today that we take it for granted that everyone has one.

彼は自分が病人だと思い込んでいる。

He is convinced that he is sick.

彼女は彼が無罪だと思い込んでいる。

She is convinced that he is innocent.