Informal. tedious, repetitious work; drudgery.
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Also don·key·work [dong-kee-wurk, dawng‐, duhng‐] /ˈdɒŋ kiˌwɜrk, ˈdɔŋ‐, ˈdʌŋ‐/.
Origin of donkey work
First recorded in 1915–20
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for donkey-work
drudgeryUS equivalent: draft-mule work
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