donkeywork

/D AA1 NG K IY0 W ER0 K/
noun
  1. 1

    Hard, boring, routine work.

    โ€œWhy does everyone else get the interesting work while I have to do all the donkey work?โ€

Source: https://en.wiktionary.org/wiki/donkey%20work, https://en.wiktionary.org/wiki/donkeywork