Adjective on the job has 2 senses
  1. on-the-job - relating to or associated with a job or employment; "on-the-job training"; "on-the-job requirements"
    Antonym: unemployed (indirect, via employed)
  2. on the alert, on the job - watchful and prepared for action; "bird watchers on the alert for a rare species"; "cops were on the job and caught them red-handed"
    Antonym: unalert (indirect, via alert)
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