sign-in

[sahyn-in]

Origin of sign-in

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

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Word Origin and History for sign-in
n.

1968, from the verbal phrase; see sign (v.) + in (adv.).

Online Etymology Dictionary, © 2010 Douglas Harper