noun. the outer sole of a shoe or boot that is the bottom of the shoe and makes contact with the ground.
1. Noun, singular or mass Seek excessive wear on the outside edge of your outsole after you rule out overpronation. 2. Adjective If you plan on doing a lot of racing, though, the one thing you might look for is a shoe where the upper and outsole are stripped down a bit for weight. 3. Verb, base form If you can see the full width of the middle part of your footprint clearly when you walk on the beach, from the insole to outsole, you probably have a low arch.