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Verb: cotton up
Usage: archaic
  1. Ingratiate oneself to; often with insincere behaviour
    "He cottoned up to the boss hoping for a promotion";
    - cozy up [N. Amer], play up [informal], suck up, cosy up [Brit, Cdn]

Derived forms: cottons up, cottoned up, cottoning up

Type of: ingratiate