Princeton's WordNet

1. backlog(noun)

   an accumulation of jobs not done or materials not processed that are yet to be dealt with (especially unfilled customer orders for products or services)

2. backlog(noun)

   the large log at the back of a hearth fire

3. reserve, backlog, stockpile(verb)

   something kept back or saved for future use or a special purpose

4. backlog(verb)

   accumulate and create a backlog

Wiktionary

1. backlog(Noun)

   An accumulation or buildup, especially of unfilled orders or unfinished work

   He went to work on Saturday to try to work through the backlog of papers on his desk.

2. backlog(Noun)

   A reserve source or supply

3. backlog(Verb)

   To acquire something as a backlog, or to become a backlog

Webster Dictionary

1. Backlog(noun)

   a large stick of wood, forming the back of a fire on the hearth

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