sign up phr v 1 [T sign sb ↔ up] to agree to give someone a job, for example in a sports team or musical group 签约聘请，签约雇用: The Yankees signed him up when he finished college. 扬基队是在他念完大学之后和他签约的。 2 [I] to put your name on a list because you want to do something 报名: + for Twenty people signed up for the trip to Paris. 二十人报名参加巴黎之行。