sign up
phrasal verbsign 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 （使）簽約受僱（或入伍） He signed on for five years in the army. 他簽了在部隊服役五年的合同。 The company has signed up three top models for the fashion show. 爲時裝表演，公司簽約聘了三名頂尖模特兒。
sign up (for something)
to arrange to do a course of study by adding your name to the list of people doing it 報名（參加課程） You can sign up online for language classes. 你可以在網上報名參加語言課程。