Blow off and Go back on

Blow off verb - To end a usually intimate relationship with.

Go back on and blow off are semantically related. in withdraw topic. In some cases you can use "Go back on" instead a verb "Blow off", when it comes to topics like back down.

Go back on verb - Fail to fulfill a promise or obligation.

Blow off and go back on are semantically related. Sometimes you can replace term "Blow off" with "Go back on", this phrasal verbs are similar.