当我们说 to turn (something) on its head, 这个短语的意思就是完全改变什么事情。另外它也指完全错误的理解了一件事情。

例句

The internet has turned the music industry on its head. Today many people would rather buy their favourite tracks straight from websites rather than a shop.

Picasso turned art on its head.

请注意

当我们看到 turn heads 这个短语时，意思就是指某人特别有意思或者很有魅力，以至于其他人的目光不由自主的被他们吸引。

Thelma was used to turning heads. She's always taken care of her figure and walks around with the best clothes.