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笑ってしまう

can't help laughing

→ 笑う
phrase Rare #24,354
can't help laughing The 〜てしまう pattern can indicate an unintended or spontaneous action, often translated as “end up laughing.”
JA: その話を聞くと、いつも笑ってしまう。
EN: Whenever I hear that story, I can't help laughing.

彼はよく自分で自分のジョークに笑ってしまう。

He often laughs at his own jokes.

彼の漫画を読むと、いつも笑ってしまう。

Whenever I read his manga, I can't help but laugh.

彼の漫画を読むといつも笑ってしまう。

I always end up laughing when I read his manga.