Longman Dictionary of Contemporary English homepage

Date: 1900-2000
Origin: backlog 'large piece of wood placed at the back of a fire' (17-21 centuries)

backlog

 noun
     
back‧log [countable usually singular]
a large amount of work that you need to complete, especially work that should already have been completed
backlog of
a backlog of requests
It's going to take us months to clear the backlog.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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