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1. To mark one's arrival at work, as on a time clock (a device that stamps the arrival and departure time onto each employee's timecard, or records the times digitally). In this usage, a noun or pronoun can be used between "clock" and "in." I got in trouble with the boss because I clocked in 20 minutes late today. Go see Janet, she'll clock you in.
2. To complete a task or competition in a certain length of time. Unfortunately, you clocked in five-tenths of a second behind the swimmer who won the race.
3. To reach a certain speed. Did you see that? His slap shot clocked in at 80 miles per hour!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
clock someone in
to observe and record someone's time of arrival. The manager says he clocked you in at noon. That's a bit late, isn't it?
to record one's time of arrival, usually by punching a time clock. What time did she clock in? She forgot to clock in today.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
Begin work, as in She clocked in late again. Also, clock out, end work, as in Please wait for me; I forgot to clock out. The allusion here is to punching a time clock, a device that punches the time on a card to record when an employee arrives and departs. [Late 1800s]
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
1. To begin an activity at some recorded time, as by stamping the time on a timecard: The workers must clock in before 8:00.
2. To be measured as having some speed: The fastest bicycle riders clocked in at over 40 miles per hour.
3. To complete a task or activity after some duration of time: The slowest cars in the race clocked in at 12 minutes.
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
in. to record one’s arrival at a set time. He clocked in three minutes late.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.