A day away from work, school, or a similar obligation; a free day. For example, Sophie always used her day off to do errands. [Late 1800s]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
Examples from the Web for day off
I left Elise and the cook alone, two poor defenceless women; the gardener is taking his weekly day-off in the village.The Destroying Angel
Louis Joseph Vance