[bak-lawg, -log]
a reserve or accumulation, as of stock, work, or business: a backlog of business orders.
a large log at the back of a hearth to keep up a fire. Compare forestick.
verb (used with object), backlogged, backlogging.
to hold in reserve, as for future handling or repair.
to enter and acknowledge (an order) for future shipment.
verb (used without object), backlogged, backlogging.
to accumulate in a backlog: Orders are starting to backlog faster than we can process them.

1675–85; back1 + log

1. supply, stock, store, fund, cache, reservoir. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
backlog (ˈbækˌlɒɡ)
1.  an accumulation of uncompleted work, unsold stock, etc, to be dealt with
2.  chiefly (US), (Canadian) a large log at the back of a fireplace

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1680s, from back + log. Originally a large log placed at the back of a fire. Figurative sense is first attested 1883, via notion of "a reserve of something stored up."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
And this year's market is bursting with recession-related backlog.
For bulk carriers alone, the backlog is equivalent to more than two-thirds of
  existing capacity.
And a backlog of candidates clamouring for university places emerged.
There is thus a backlog of candidates clamouring for university places.
Related Words
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