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Verb: sign up
  1. Engage by written agreement
    "They signed up two new pitchers for the next season";
    - sign, contract, sign on
     
  2. Join a club, an activity, etc. with the intention to join or participate
    "Sign up for yoga classes"

Derived forms: signing up, signed up, signs up

Type of: employ, engage, fall in, get together, hire, join