skiyoudaoicibaDictYouDict[ski 词源字典]
ski: [19] A ski is etymologically a piece of wood ‘split’ from a tree trunk. The word was borrowed from Norwegian ski, a descendant of Old Norse skíth ‘piece of split wood, ski’. This in turn came from the prehistoric Germanic base *skīth-, *skaith- ‘divide, split’, source also of English sheath, shed, etc. The Norwegian word is pronounced /she/, and that is the way in which it was once often said (and indeed sometimes spelled) in English. (Old Norse skíth may also lie behind English skid [17], which originally meant ‘block of wood used as a support’, hence ‘wooden chock for stopping a wheel’.

The modern sense only emerged in the 19th century, from the notion of a wheel slipping when it is prevented from revolving.)
=> sheath, shed, skid[ski etymology, ski origin, 英语词源]
ski (n.)youdaoicibaDictYouDict
1883 (there is an isolated instance from 1755; in early use often spelled skee), from Norwegian ski, related to Old Norse skið "long snowshoe," literally "stick of wood, firewood," cognate with Old English scid "stick of wood," obsolete English shide "piece of wood split off from timber;" Old High German skit, German Scheit "log," from Proto-Germanic *skid- "to divide, split," from PIE root *skei- "to cut, split" (see shed (v.)). Ski-jumper is from 1894; ski bum first attested 1960; ski-mask is from 1963; noted as part of criminal disguises from 1968.
ski (v.)youdaoicibaDictYouDict
1885, from ski (n.). Related: Skied; skiing.