IPA: /ˈʃuːtriː/
KK: /ˈʃuːˌtriː/
A device made of wood, metal, or other hard material that is placed inside a shoe to help it keep its shape and prevent it from getting damaged.
He always uses a shoetree to maintain the shape of his favorite dress shoes.
Shoetree is formed from "shoe" (from Old English *sceo*, meaning a covering for the foot) and "tree" (from Old English *treow*, meaning a wooden structure). A shoetree is a wooden structure used to maintain the shape of a shoe.
Think of a 'shoe' as a covering for your foot and a 'tree' as a wooden structure that helps keep the shoe's shape.