1. sign_up - verb
· engage by written agreement; "They signed two new pitchers for the next season"
Synonym(s): sign, contract, sign_on
Hypernym(s): hire, engage, employ
2. sign_up - verb
· join a club, an activity, etc. with the intention to join or participate; "Sign up for yoga classes"
Hypernym(s): join, fall_in, get_together
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