American English

Definition of sign up/on phrasal verb from the Oxford Advanced American Dictionary

 

sign up/on

 phrasal verb
phrasal verb
 
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Phrasal Verbs

sign up/on

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sign somebodyup/on

 
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to sign a form or contract which says that you agree to do a job or become a soldier; to persuade someone to sign a form or contract like this synonym enlist He signed up for two years in the army. The company has signed on three top models for the fashion show.