sign up Meaning in the Cambridge English Dictionary
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Meaning of “sign up” in the English Dictionary

"sign up" in British English

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sign up

phrasal verb with sign uk   us   /saɪn/ verb
B1 to ​agree to ​becomeinvolved in an ​organizedactivity: [+ to infinitive] I've ​signed up to make the ​sandwiches for the ​party. She's ​signed up foreveningclasses at the ​communitycollege.
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(Definition of sign up from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"sign up" in American English

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sign up

phrasal verb with sign  us   /sɑɪn/ verb
to ​join a ​group or ​organization: Kathy signed up for the ​soccerteam this ​year.
(Definition of sign up from the Cambridge Academic Content Dictionary © Cambridge University Press)

"sign-up" in Business English

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sign-upnoun

uk   us  
[U] an occasion when you ​start doing or having something or ​start being a ​member of a ​group, especially by ​signing a ​document: Instead of ​paying a sign-up ​fee, ​investorspay a ​feebased on the ​amount they ​invest. The ​card recently was ​charging $20 at sign-up and $3.50 a month to use.
[C] someone who ​starts to do or have something, for ​example someone who ​opens a ​bankaccount: The ​bank has had hundreds of sign-ups for the new ​account.
(Definition of sign-up from the Cambridge Business English Dictionary © Cambridge University Press)
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