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punch in

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1

Also, punch a or the clock. Check in at a job upon arrival, as in You have to punch in or you won't get paid, or In this office no one has to punch a clock. This usage alludes to the use of a time clock, which has a button an employee punches or strikes to record the time of arrival on a card. [1920s] Also see punch out, def. 1.

2

Keyboard data into a computer, as in He was careful about punching in all the payments. [Mid-1900s]

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.

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