Verb chat up has 2 senses
  1. chat up, flirt, dally, butterfly, coquet, coquette, romance, philander, mash - talk or behave amorously, without serious intentions; "The guys always try to chat up the new secretaries"; "My husband never flirts with other women"
    --1 is one way to talk, speak
    Sample sentence:
    Sam cannot chat up Sue
  2. chat up - talk to someone with the aim of persuading him
    --2 is one way to
    persuade
    Sample sentence:
    Somebody ----s somebody
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