plural noun British.
certain crown lands, the stewardship of which is nominally bestowed on a member of the House of Commons to provide an excuse to resign, as members are not allowed to hold titular office from the crown.
to apply for the Chiltern Hundreds, to resign or express a desire to resign from the House of Commons.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
(in Britain) short for Stewardship of the Chiltern Hundreds; a nominal office that an MP applies for in order to resign his seat
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012