Definition of backlog noun from the Oxford Advanced Learner's Dictionary

 

backlog

 noun
noun
BrE BrE//ˈbæklɒɡ//
 
; NAmE NAmE//ˈbæklɔːɡ//
 
, NAmE//ˈbæklɑːɡ//
 
 
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a quantity of work that should have been done already, but has not yet been done When she eventually returned to work, there was a tremendous backlog of paperwork to catch up on. We are faced with a backlog of orders we can’t deal with.
See the Oxford Advanced American Dictionary entry: backlog