a.

1. 非常高的
   He kicked the football sky-high for the extra point.

   他把足球踢得老高，多得一分。

2. 高昂的
   Gasoline prices went sky-high during the oil embargo.

   石油禁运期间油价涨成了天价。

ad.

1. 高空中；天一般高地

adv.

adj.

1. as if reaching the sky; very high.
2. at or to a very high level; very great.