Definitions
1.NounA large log to burn at the back of a fire.
2.NounA reserve source or supply.
3.NounAn 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."
4.NounA log containing text previously read, as in text-based video games or chat rooms.
5.VerbTo acquire something as a backlog, or to become a backlog