clean break
A complete removal from a (usually negative) situation, relationship, or attachment, with no intention of returning. After spending years in an emotionally abusive relationship, Patrick finally decided to make a clean break and leave his girlfriend. I had hoped my ex and I would stay friends after our breakup, but she really needed to make a clean break—that's why I haven't talked to her. I got bullied pretty badly at that school and needed to make a clean break sooner rather than later.
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