chat-up line
noun [ C ] UK informal informal uk/ˈtʃæt.ʌp ˌlaɪn/ us/ˈtʃæt̬.ʌp ˌlaɪn/ (US come-on line)
（与对自己有性吸引力的人）调情的话，搭讪的话
a remark that someone makes to another person to make their sexual interest known to that person and start a conversation
"Have you been here before?" "That's one of the oldest chat-up lines I've ever heard!" “你以前来过这儿吗?”“这是我所听过的最老套的搭讪之一。”