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.The department head is in a bad mood today, so it's a good thing all of the interns clocked in on time for once.
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.I don't know how, but I somehow managed to clock in just ahead of the fastest kid in our class!Ugh, I ran my hardest and still clocked in behind Mona.
3. To reach a certain speed. Did you see that? His slap shot clocked in at 80 miles per hour!You're getting a ticket because you clocked in at 90 miles an hour—and the speed limit here is only 55.Coach said your last fastball clocked in at 93 miles per hour—nicely done!
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]
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