n. pl. skis
a. One of a pair of long flat runners of plastic, metal, or wood that curve upward in front and may be attached to a boot for gliding or traveling over snow.
b. A water ski.
2. Something that is used as a runner on a vehicle: a helicopter with skis for landing on snow and ice.
v. skied, ski·ing, skis
To travel or glide on skis, especially as a sport.
To travel or glide over on skis: ski a mountain slope.
over one's skis
Hasty, rash, or overambitious.
[Norwegian, from Old Norse skīdh, stick, snowshoe; see skei- in the Appendix of Indo-European roots.]
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