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English definition of “sign up”

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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.
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(Definition of sign up from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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