verb (used with object), dou·ble-spaced, dou·ble-spac·ing.
to type (text, copy, etc.) leaving a full space between lines: Always double-space a term paper.
verb (used without object), dou·ble-spaced, dou·ble-spac·ing.
to type leaving a full space between lines: I can never remember to double-space.
Origin of double-space
First recorded in 1895–1900
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
to type (copy) with a full space between lines
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