Sign in synonyms
To return (a book to a library, source code to a repository, etc.).
To record (someone) as leaving the premises or as taking something therefrom, as from a library or shop.
Find another word for sign in. In this page you can discover 10 synonyms, antonyms, idiomatic expressions, and related words for sign in, like: check in, check out, sortin, clockin, bustin, sign on, log in, log on, login and logon.