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sign-up

or sign·up

[sahyn-uhp]
noun
  1. an act or instance of signing up.
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Origin of sign-up

First recorded in 1945–50; noun use of verb phrase sign up
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Word Origin and History for signups

sign-up

n.

"number who have signed up," 1926, from the verbal phrase; see sign (v.) + up (adv.).

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Online Etymology Dictionary, © 2010 Douglas Harper