前嫌

former hatred / bygone enmity

front / forward / ahead / first / top (followed by a number) / future / ago / before / BC (e.g. 前293年) / former / formerly

to dislike / suspicion / resentment / enmity / abbr. for 嫌犯[xian2 fan4], criminal suspect

to forget previous differences / to bury the hatchet

to forget former enmity (idiom)