noun
a phrase used to refer to a situation where a payment or deadline has passed
adjective
a phrase used to describe something that is overdue or late in payment
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The invoice is now past due and requires immediate payment.
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Hey, just a heads up that your bill is past due.
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Dude, your rent is hella past due, you gotta pay up.
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The deadline for the project is past due, we need to catch up quickly.