a burglar who breaks into buildings by climbing through upstairs windows, across roofs, etc., especially with great stealth and agility.
Origin of cat burglar
First recorded in 1905–10
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for cat burglar
a burglar who enters buildings by climbing through upper windows, skylights, etc
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