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Verb: chat up
Usage: informal
  1. Talk to someone with the aim of persuading them
    "He tried to chat up the bartender for a free drink"
     
  2. Talk or behave amorously, without serious intentions
    "The guys always try to chat up the new secretaries";
    - flirt, dally, coquet [rare], romance, mash [archaic]

Derived forms: chatted up, chats up, chatting up

Type of: persuade, speak, talk