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1. Talk or behave amorously, without serious intentions
   "The guys always try to chat up the new secretaries";
   - flirt, dally, butterfly, coquet, coquette, romance, philander, mash, flirter
    
2. Talk to someone with the aim of persuading him

Derived forms: chats up, chatting up, chatted up

Type of: persuade, speak, talk