sign on
phrasal verbsign on  
- (British English, informal) to sign a form stating that you are an unemployed person so that you can receive payment from the governmentTopics Social issuesc2
 
sign on/up | sign somebody  on/up  
- to sign a form or contract which says that you agree to do a job or become a soldier; to persuade somebody to sign a form or contract like this synonym enlist
- He signed on for five years in the army.
 - The company has signed up three top models for the fashion show.