a completely absurd, pointless, or useless errand.
How Did April 1 Become “April Fools’ Day”?How did this odd, prank-centric holiday come to be celebrated in the first place, and why is it called April Fools' Day?
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for fool's errand
a fruitless undertaking
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 fool's errand
A fruitless mission or undertaking, as in Asking the bank for yet another loan was clearly a fool's errand. [c. 1700]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.