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Verb sign-up has 2 senses
sign, contract, sign on, sign up - engage by written agreement; "They signed two new pitchers for the next season"--1 is one way to hire, engage, employ
 Sample sentence:
 Somebody ----s somebody
 
sign up - join a club, an activity, etc. with the intention to join or participate, "Sign up for yoga classes"--2 is one way to join, fall in, get together
 Sample sentences:
 Somebody ----s
 Somebody ----s PP
 
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