sign in

verb

Definition of sign in 

intransitive verb

: to make a record of arrival by signing a register or punching a time clock

transitive verb

: to record arrival of (a person) or receipt of (an article) by signing

First Known Use of sign in

1903, in the meaning defined at intransitive sense

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The first known use of sign in was in 1903

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not any or not one

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