eleventh hour

eleventh hour idiom
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]

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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