英語復合詞 sky-high 是形容詞，表示達到了極高的程度。

例句

Train fares have gone sky-high. I spend half my pay just getting to work!

The prime ministers popularity^{1 was sky-high after he cut taxes for everybody.}

Id like to buy a house in the city but prices are sky-high.

請注意

If you say that the sky is the limit, it means that anything is possible.

另一個短語是 the sky is the limit, 意思是沒限制，任何可能性都存在。

If you have talent and work hard, the sky is the limit.