on the job

on the job idiom
  1. At work, busy, as in We've got three men on the job. [Late 1800s]
  2. Paying close attention, alert, as in Trust Jim to find out the details—he's always on the job.

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.

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