grunt work

Etymology
From the verb.

Noun

 * 1)  Work (especially that which is heavy, repetitive or mindless) that is considered undesirable and therefore delegated to underlings.
 * He plans to hire somebody to do the grunt work of digging the trenches for the pipes.
 * He plans to hire somebody to do the grunt work of digging the trenches for the pipes.

Translations

 * Chinese:
 * Mandarin: 枯燥乏味的工作
 * Finnish: hanttihomma
 * Polish:, czarna robota
 * Russian: чёрная рабо́та