off-hour definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
not occurring during or pertaining to rush hour, regular business hours, or other busy periods of time: off-hour traffic conditions
off-hour definition by American Heritage Dictionary
A period of time during which motor vehicular and pedestrian traffic is light.