noun
an accumulation of uncompleted work or matters awaiting attention or settlement
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The company is struggling to keep up with the backlog of orders due to supply chain issues.
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I have a huge backlog of emails to respond to, I really need to catch up.
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I can't go out tonight, I have a massive backlog of homework to finish.
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The backlog of unresolved issues in their relationship eventually led to a breakup.