1. (noun) backlog
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)
Synonyms: stockpile, reserve
2. (noun) backlog
the large log at the back of a hearth fire
Synonyms: stockpile, reserve
3. (verb) reserve, backlog, stockpile
something kept back or saved for future use or a special purpose
Synonyms: stockpile, second-stringer, taciturnity, reservation, modesty, reserve, backlog, military reserve, reticence, substitute
4. (verb) backlog
accumulate and create a backlog
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