0 to fail to keep a promise, or to change a decision or agreement: --
She's gone back on her word and decided not to give me the job after all.
The government looks likely to go back on its decision to close the mines.
1 to not keep a promise, or to change a decision or agreement: --
NYA ORD
European
May 10, 2021
DAGENS ORD
Shimmer
go back on sth