1: a line drawn within or around a prison that a prisoner passes at the risk of being shot

2a: a date or time before which something must be done

b: the time after which copy is not accepted for a particular issue of a publication

on deadline or under deadline

with the requirement of meeting a deadline working on deadline

Examples of Deadline in a Sentence

She worked on her composition right up until the deadline.  We had to hurry to meet the deadline.  The project was completed a week past its deadline.