to change the way one addresses sb (as when one marries and starts to call one's husband's parents 爸爸[ba4 ba5] and 媽媽|妈妈[ma1 ma5])
Definitions (粵典–words.hk)
動詞
收返或者更改曾經講過嘅嘢 to withdraw or modify one's previous remark; to correct oneself
佢一知自己講錯嘢即刻改口。
佢一知自己讲错嘢即刻改口。
keoi5 jat1 zi1 zi6 gei2 gong2 co3 je5 zik1 haak1 goi2 hau2. As soon as he knew he'd made a mistake, he immediately corrected himself.
佢哋本身話等朋友,之後又改口話係等巴士。
佢哋本身话等朋友,之后又改口话系等巴士。
keoi5 dei6 bun2 san1 waa6 dang2 pang4 jau5, zi1 hau6 jau6 goi2 hau2 waa6 hai6 dang2 baa1 si2. First they said they were waiting for some friend, later they changed their story and said they were waiting for the bus.
Definitions (Wiktionary)
verb
to address someone by a different name (syn.) 变口, 變口, 轉喙, 转喙
verb
to change accent
以前佢讲开美国口音,但系去到英国嘅时候,佢改口讲英国口音。
以前佢讲开美国口音,但系去到英国嘅时候,佢改口讲英国口音。
ji5 cin4 keoi5 gong2 hoi1 mei5 gwok3 hau2 jam1, daan6 hai6 heoi3 dou3 jing1 gwok3 ge3 si4 hau6, keoi5 goi2 hau2 gong2 jing1 gwok3 hau2 jam1. Before, he used to speak with American accent, but when he goes to UK, he changed to British accent.