Frighten the hell out of sb.

Scare the hell out of sb.

Frighten the shit out of sb.

Scare the shit out of sb.

吓死某人了 (夸张)

Oh man! You scared the shit out of me! What’s your problem?

啊！吓死宝宝了！你想干嘛呀？

Don't sneak up on me like that, you frightened the hell out of me!

别鬼鬼祟祟到我面前！你吓死我了！

Scare sb. to death

吓死某人了 (夸张)

I am scared to death every time when I hear him singing.

他每次唱歌，我都快被吓死了。

Be scared shitless (VERY RUDE)

被吓得屁滚尿流的

I was scared shitless when I woke up to the sounds of an intruder in my house.

当房子里有陌生人进来的声音吵醒我时，我快被吓死了。

Scare sth./sb. away.

吓跑

Don't make too much noise or you'll scare away the birds.

别太大声，会把鸟吓跑的。

Freak out 惊讶，吃惊

He freaked out when hearing the news.

他听到这个消息很吃惊。