breaking faith and abandoning right (idiom); to betray
treachery
perfidy
Definitions (粵典–words.hk)
語句
違背自己嘅承諾,唔顧道義 to renege on one's promises and betray others' trust
明哥唔係背信棄義嘅人,佢一定係有苦衷㗎。
明哥唔系背信弃义嘅人,佢一定系有苦衷㗎。
ming4 go1 m4 hai6 bui3 seon3 hei3 ji6 ge3 jan4, keoi5 jat1 ding6 hai6 jau5 fu2 cung1 gaa3. Brother Ming is not a person who breaks promises and betrays others' trust. He must have his reasons.
Definitions (Wiktionary)
phrase, idiomatic
to break the faith and disregard righteousness; to act perfidiously; perfidious, treacherous; treachery, perfidy
Definitions (Kaifangcidian)
(沒有對應漢語詞彙)
Examples (粵典–words.hk)
Cantonese
背信弃义
背信棄義
to renegade on one's promises and betray others' trust