go back on
verb1
To be treacherous or faithless to; to betray.
- to go back on friends
2
To fail to keep; to renege on.
- to go back on one's promises
- BBC News On Sunday Iranian President Mahmoud Ahmadinejad said his country would not go back on its nuclear programme.
3
Used other than figuratively or idiomatically: see go, back, go back, on.
- He went back on the same path.
- They said the electricity will go back on before midnight.
- Derived terms
- go back on one's word