- 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