backlog /ˈbak(ˌ)lɔɡ/noun 4verb 1forms 3 noun4 •A reserve source or supply. •An accumulation or buildup, especially of unfilled orders, unconsumed products or unfinished work.He went to work on Saturday to try to work through the backlog of papers on his desk.Kyle purchased a new one despite having a backlog of video games that he hasn't played. •A log containing text previously read, as in text-based video games or chat rooms. •A large log to burn at the back of a fire.While she was preparing my breakfast, I chopped off a backlog and put it on the fire,[…] — 1830 verb1 •To acquire something as a backlog, or to become a backlog formsbacklogged · backlogging · backlogs