Synonyms of 'sign up'
▷ See sign
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If someone enlists or is enlisted, they join the army, navy, marines, or air force.
He enlisted as a private in the Mexican War.
To enrol for the conference, fill in the attached form.
Thesaurus for sign up from the Collins English Thesaurus
If you sign up for an organization or if an organization signs you up , you sign a contract officially agreeing to do a job or course of study.