a minor, polite, or harmless lie; fib.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for white lie
a minor or unimportant lie, esp one uttered in the interests of tact or politeness
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
Idioms and Phrases with white lie
An untruth told to spare feelings or from politeness, as in She asked if I liked her dress, and of course I told a white lie. This term uses white in the sense of “harmless.” [First half of 1700s]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.