What does "get back on something" mean here?
Native speaker’s answer
Rebecca
In this case, he says "back on the job" because he is returning to his old job. To "get back on something" or "get back to something" in general means to return to something or resume doing something. Ex: I need to get back into playing guitar. It's been awhile since I've played. Ex: Let's get back on the road so we can make it there before dark.