Cannot help doing something; involuntarily or spontaneously.
由不得自己，控制不住自己。
清·曹雪芹《红楼梦》第八十一回我也不很记得了，但觉自己身子不由自主，倒象有什么人，拉拉扯扯，要我杀人才好。”
He couldn't help but laugh at her joke.
Learn the next connected idiom: 不由自主 (bù yóu zì zhǔ) → 助人为乐 (zhù rén wéi lè)
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