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Adjective on-the-job has 2 senses
working, on the job - actively engaged in paid work; "the working population"; "the ratio of working men to unemployed"; "a working mother"; "robots can be on the job day and night"Antonym:  unemployed (indirect, via employed)
 
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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