dor·si·flex \-ˌfleks\verb Etymology:dors- + flex intransitive verb : to flex in a dorsal direction < the toe will dorsiflex > transitive verb : to cause to flex in a dorsal direction < various central lesions both dorsiflex and supinate the foot > • dor·si·flex·ion\ˌ ̷ ̷ ̷ ̷ˈflekshən\noun