<p><strong>Noun</strong></p><ul><li>a pack or knapsack, often of canvas or nylon, to be carried on one's back, sometimes supported on a lightweight metal frame strapped to the body.</li><li>a piece of equipment designed to be used while being carried on the back.</li></ul><p><strong>Verb</strong></p><ul><li>(used without object) to go on a hike, using a backpack: We went backpacking in the Adirondacks.</li><li>(used with object) to place or carry in a backpack or on one's back.</li></ul>