verb (used with object)
to accept reservations for in excess of the number that can be accommodated: The airline routinely overbooks its flights so as to fill its planes even if there are last-minute cancellations.
verb (used without object)
to accept reservations in excess of the number that can be accommodated: If the hotel has overbooked, some of the conventioners won't have a place to stay.

1900–05; over- + book (v.)

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To overbook
World English Dictionary
overbook (ˈəʊvəˌbuːk)
(tr) to make more reservations than there are places, tickets, hotel rooms, etc, available

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
Word Origin & History

"to sell more tickets than there are seats," 1903, from over + book, originally in ref. to theaters.
Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
Example sentences
Conferences become no fun in a hurry when you overbook yourself.
The airlines may alter scheduled stops, cancel or postpone flights on short
  notice, and regularly overbook flights.
Indicate whether to override the resource calendar and require the user to
  manually intervene to overbook resources.
We do not overbook appointments to prevent you and others from having to wait a
  lot longer for service.
Related Words
Copyright © 2014 Dictionary.com, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature