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English definition of “sign up”

sign up

verb uk phrasal verb with sign   /saɪn/ us  
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
Joining and leaving groups and organizations
(Definition of sign up from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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