verb (used with object), de·fragged, de·frag·ging. Computers, Informal.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
verb -frags, -fragging or -fragged
to consolidate fragmented files and folders on (the hard drive of a computer or other electronic device) in order to make it run more efficiently
Word Origin for defrag
short for defragment
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