Deadline vs. Overdue

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Difference Between Deadline and Overdue
Deadlinenoun
A date on or before which something must be completed.
I must make this deadline or my boss will kill me!Overdueadjective
Late; especially, past a deadline or too late to fulfill a need.
his library books were three days overdue;my car is overdue for an oil change;she finally left on a long overdue vacationDeadlinenoun
(archaic) A guideline marked on a plate for a printing press.
Overdueadjective
past due; not paid at the scheduled time;
an overdue installmenta delinquent accountDeadlinenoun
(archaic) A line that does not move. en
Deadlinenoun
(archaic) A boundary around a prison, prisoners crossing which would be shot.
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Deadlineverb
(military) To render an item non-mission-capable; to ground an aircraft, etc.
Deadlinenoun
the point in time at which something must be completed