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English definition of “sign up”

sign up

phrasal verb with sign     /saɪn/ verb
B1 to agree to become involved in an organized activity: [+ to infinitive] I've signed up to do the sandwiches for the street party. She's signed up for evening classes at the community college. → See also sign onJoining and leaving groups and organizations
(Definition of sign up from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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