sign up - definition and synonyms

phrasal verb
present tense
I/you/we/theysign up
he/she/itsigns up
present participlesigning up
past tensesigned up
past participlesigned up
  1. 1
    [intransitive] to agree to do something, or to join a course or organization
    sign up for:

    She’s decided to sign up for evening classes.

  2. 2
    [transitive] to put someone’s name on an official list for something
    sign someone up (to do something):

    They’ve signed me up to do voluntary work next month.

  3. 3
    [transitive] same as sign2 (sense 2)

    We have signed up two new players.

See also main entry: sign