IPA: //ˈtrʌŋkfəl//
KK: /trʌŋkˈfʊl/
The amount that can be held in a trunk, often used to describe a large quantity of items or goods.
We packed a trunkful of clothes for our trip to the beach.
Trunkful → It is formed from "trunk" (from Old French *tronc*, meaning the main stem of a tree or a large container) and "-ful" (meaning full of). The word "trunkful" means full of trunk or the amount that a trunk can hold.
Think of a trunk being 'full of' something — that's what trunkful means.