Wiktionary
prehung
a. (context of a door or window English) Delivered to the customer as installation-ready unit, already attached to its frame.
Usage examples of "prehung".
They had spent many furtive hours discovering the route to usewhich entailed first slipping out their bedroom window, then around a dormer and down a rain gutter, along a wall lined with decorative, crenelated fortifications, through a loose window into an attic, and down a rope ladder that they had prehung inside a sealed-off, abandoned chimney .