IPA: /ˈspeɪdˌwɜːrk/
KK: /ˈspeɪdˌwɜrk/
The necessary work done before starting a project or activity, often involving research or preparation.
Before we can start the construction, we need to complete the spadework.
Spadework is formed from "spade" (from Old English *spadu*, meaning a tool for digging) and "work" (from Old English *weorc*, meaning effort or labor). The term refers to the preliminary or basic work that is necessary to prepare for a larger task, akin to the initial digging done with a spade.
Think of using a 'spade' to do the initial 'work' needed to prepare for something bigger — that's what spadework means.