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English definition of “sign-up”

sign-up

noun    
[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, investors pay a fee based 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 bank account: The bank has had hundreds of sign-ups for the new account.
(Definition of sign-up noun from the Cambridge Business English Dictionary © Cambridge University Press)
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