On the watch and On the job

On the job and on the watch are semantically related in on the lookout topic. In some cases you can use "On the job" instead an adjective phrase "On the watch".

On the job adjective - Actively engaged in paid work.

On the watch and on the job are semantically related in on the lookout topic. Sometimes you can use "On the watch" instead an adjective phrase "On the job".