What does 思い込む mean?
思い込む is a Japanese verb meaning “to be under impression that, to be convinced that” in English. It can also be translated as “to make up one's mind, to be obsessed (with a thought, idea, etc.)” depending on context. It is written as 思い込む in kanji, おもいこむ in hiragana, and omoikomu in romaji. This word is part of JLPT N2 vocabulary.
Example sentence
彼が僕にそう思い込ませたのです。
He put the idea into my head.