1.
If you say that a change or an event is overdue, you mean that you think it should have happened before now.
This debate is long overdue...
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2.
Overdue sums of money have not been paid, even though it is later than the date on which they should have been paid.
Teachers have joined a strike aimed at forcing the government to pay overdue salaries and allowances.
ADJ
3.
An overdue library book has not been returned to the library, even though the date on which it should have been returned has passed.
ADJ