adverb, adjective
very high: Costs have gone sky-high since the war.

1810–20 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
adj, —adv
1.  at or to an unprecedented or excessive level: prices rocketed sky-high
2.  high into the air
3.  blow sky-high to destroy completely

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
They tended to join the great housing-market party late, when prices were
  already sky-high.
The figures aren't particularly surprising, given the sky-high price of real
  estate around those campuses.
But also to ensure that the labor market was not glutted with low-skilled
  workers that would shoot unemployment sky-high.
The sky-high prices threaten to exclude from the farmers' market anyone who
  isn't a hedge fund manager.
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