BE DISLOYAL TO, be unfaithful to, be untrue to, betray, play someone false, break one's promise to, fail, let down; double-cross, deceive, cheat, stab in the back; informal do the dirty on.
2192; headword
BREAK FAITH WITH
Meaning of BREAK FAITH WITH in English
Concise Oxford thesaurus English vocabulary. Краткий оксфордский словарь английского языка тезаурус. 2012