As a Noun: 1. The sport in which you move on snow wearing long, flat, narrow pieces of wood, metal, or plastic that are fastened to boots. English = skiing. 2. The sport in which you ski on water while being pulled by a boat. English = water-skiing. As a Verb or Adjective: 1. To move over snow using skis. English = ski. 2. To move over water using water-skis. English = water-ski.