Definition of “chat-up line” - English Dictionary

british dictionary

“chat-up line” in British English

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chat-up linenoun [ C ]

uk /ˈtʃæt.ʌp ˌlaɪn/ us /ˈtʃæt̬.ʌp ˌlaɪn/ UK informal US come-on line informal

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!"

(Definition of “chat-up line” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)