IPA: /ˈpoʊsthoʊl/
KK: /ˈpoʊsthoʊl/
A hole that is dug in the ground to support a fence post or similar structure.
The workers dug a posthole to install the new fence.
Posthole → It is formed from "post" (from Old French *poste*, meaning a stake or pole) and "hole" (from Old English *hol*, meaning an opening or hollow). The word "posthole" refers to a hole dug to set a post into the ground.
Think of a 'post' being placed into a 'hole' — that's what a posthole is, a hole for a post.