Fig. at the last possible moment. (Just before the last clock hour, 12) She always turned her term papers in at the eleventh hour.We don't worry about death until the eleventh hour.
Fig. a decision made very late in a process, or at the last possible moment. Eleventh-hour decisions are seldom satisfactory.The president's eleventh-hour decision was made in a great hurry, but it turned out to be correct.
The latest possible time, as in We turned in our report at the eleventh hour. This term is thought to allude to the parable of the laborers (Matthew 20:1-16), in which those workers hired at the eleventh hour of a twelve-hour working day were paid the same amount as those who began in the first hour. [Early 1800s]