反悔

to renege / to go back (on a deal) / to back out (of a promise)

contrary / in reverse / inside out or upside down / to reverse / to return / to oppose / opposite / against / anti- / to rebel / to use analogy / instead / abbr. for 反切[fan3 qie4] phonetic system

to regret

(bound form) to regret; to repent

to vow not to break one's promise