Back out and Cop-out

Back out verb - To break a promise or agreement.

Cop-out and back out are semantically related. In some cases you can replace phrase "Cop-out" with "Back out", this terms are similar.

Cop-out noun - The act or a means of getting or keeping away from something undesirable.

Back out and cop-out are semantically related. Sometimes you can use "Back out" instead a verb phrase "Cop-out".