An accumulation of tasks or matters that need to be dealt with. The company is working hard to clear the backlog of orders that built up during the holiday season.
A reserve supply or stock kept for future use. The bakery keeps a backlog of flour to prepare for busy weekends.
A large log placed at the back of a fireplace, intended to burn slowly and keep the fire going. Before nightfall, she set a sturdy backlog on the hearth to last until morning.