noun

• (chiefly literary and poetic, archaic) Usually preceded by the: the abode of God or the gods, angels, the souls of deceased people, etc.; heaven; also, powers emanating from heaven.
  "This mortal has incurred the wrath of the skies."
• (mathematics, theoretical physics) The set of all lightlike lines (or directions) passing through a given point in space-time.
• (obsolete, informal, rare) In an art gallery: the upper rows of pictures that cannot easily be seen; also, the place where such pictures are hung.
• (obsolete) A cloud.

verb

• (transitive)
• (transitive)
  "The artists—I mean the younger brood, and not the Brother Academicians who "skied" his pictures—were the first and the most enthusiastic in his [George Fuller's] praise."
• (transitive)
  "In ‘skying’ a coin for the purpose of deciding a point at issue between two parties, two methods are in vogue: there is either the ‘slow torture’ of spinning the coin thrice, the decision to go against the tosser-up, if the other party, twice out of the three times, guesses right on which side the coin shall fall; or, the ‘sudden death’ method in which one toss is decisive; […]"
• (transitive)

noun

• (UK, slang, obsolete, Westminster School) A disagreeable person; an enemy.