sign up definition, meaning - what is sign up in the British English Dictionary & Thesaurus - Cambridge Dictionaries Online

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English definition of “sign up”

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sign up

phrasal verb with sign uk   us   /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.
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(Definition of sign up from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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