To be involved in a problematic or illicit venture from which it is difficult to withdraw; to be inextricably caught in a compromising situation.
他因为一时糊涂，答应了朋友的请求，没想到就此上了贼船，现在想退出都难了
He foolishly agreed to his friend's request, never expecting to be caught in such a problematic situation, and now it's hard for him to back out.
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