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Verb: chat up
Usage: Brit, informal
  1. Talk or behave amorously, without serious intentions
    "The guys always try to chat up the new secretaries";
    - flirt, dally, coquet [rare], romance, philander, mash [archaic]
  2. Talk to someone with the aim of persuading him

Derived forms: chats up, chatted up, chatting up

Type of: persuade, speak, talk