potshot: [19] A potshot was originally a shot taken at an animal or bird simply in order to kill it for food – in order to get it into the ‘pot’, in other words – rather than in accordance with the strict code and precise techniques of shooting as a ‘sport’. Indeed to begin with it was distinctly a contemptuous term among the hunting and shooting fraternity. But gradually it broadened out in meaning to any ‘casually aimed shot’. [potshot etymology, potshot origin, 英语词源]