IPA: /ˈθɪkˌsɛt/
KK: /θɪkˌsɛt/
Having a solid and stocky body or form; often used to describe someone who is short and strong.
The thickset man easily lifted the heavy box without any help.
Thickset → It is formed from "thick" (from Old English "þicce", meaning having a large distance between opposite sides) and "set" (from Old English "settan", meaning to place or put). The word "thickset" describes something that is placed or arranged in a way that is dense or compact, often referring to a stout or stocky build.
Think of something that is 'placed' ('set') in a way that is 'dense' or 'wide' ('thick') — that's why thickset describes a stout or compact form.