Origin of busywork
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Activity meant to take up time but not actually be productive. For example, We have to put in an eight-hour day, even if we do nothing but busy work. [c. 1840]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.