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The Collaborative International Dictionary of English v.0.48 (gcide)

Backlog \Back"log`\ (b[a^]k"l[o^]g`; 115), n. [Back, a. log.]
1. A large stick of wood, forming the back of a fire on the
hearth. Contrasted to {forestick}. [U.S.]
[1913 Webster]

There was first a backlog, from fifteen to four and
twenty inches in diameter and five feet long,
imbedded in the ashes. --S. G.
Goodrich.
[1913 Webster]

2. An accumulation (of tasks or of materials) that were not
performed or processed at the normal time and require
attention; as, unexpected demand led to a large backlog of
unfilled orders; politically motivated delays led to a
large backlog of unconfirmed judicial appointments.
[PJC]