Source : WordNet®

on the job
     adj 1: 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"
            [syn: {working(a)}, {on the job(p)}]
     2: watchful and prepared for action; "bird watchers on the
        alert for a rare species"; "cops were on the job and
        caught them red-handed" [syn: {on the alert(p)}, {on the
        job(p)}]