Definition & Meaning of "[scratch|scrape] a living"

What is the origin of the idiom "scratch a living" and when to use it?

The idiom "scratch a living" likely originates from the idea of scratching or scraping the ground in search of sustenance or resources, reminiscent of how animals might forage for food. It conveys the notion of barely managing to survive by making do with whatever resources are available, often in difficult or challenging circumstances.