1. [ adjective ] (work) actively engaged in paid work
Synonyms: working

"the working population" "the ratio of working men to unemployed" "a working mother" "robots can be on the job day and night"

Related terms: employed
2. [ adjective ] watchful and prepared for action
Synonyms: on_the_alert

"bird watchers on the alert for a rare species" "cops were on the job and caught them red-handed"

Related terms: alert
Similar spelling:   on_the_go