From: http://www.bbc.co.uk/worldservice/learningenglish/language/2013/01/130108_todays_phrase_sky_high.shtml
Anders Jacobsen of Norway takes part in the Ski Jumping World Cup, Innsbruck, Austria. Picture: Lars Baron / Getty
Today's Phrase
If something is 'sky-high', it has reached a very great or high level.
Examples
Train fares have gone sky-high. I spend half my pay just getting to work!
The prime minister's popularity was sky-high after he cut taxes for everybody.
I'd like to buy a house in the city but prices are sky-high.
Take note
If you say that 'the sky is the limit', it means that anything is possible.
If you have talent and work hard, the sky is the limit.
Interesting fact
Ski jumping originated in Norway in 1809. The first ski jumper, Olaf Rye, travelled 9.5 metres before landing. Ski jumping has been part of the Olympic Winter Games since the first Games in 1924.