a 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.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
a clean ˈbreaka complete separation from a person, an organization, a way of life, etc: She wanted to make a clean break with the past and start again.
Farlex Partner Idioms Dictionary © Farlex 2017