主要内容：

be in deep water(s)

"His company is in deep water financially."

out of your league

She’s totally out of your league.

A house like that is out of our league.

(To hit) below the belt

His accusations were distinctly below the belt!

His accusations hit below the belt.

To win by a nose

Our bid for that contract was won by a nose.

There really wasn't much difference between us.

call the shots

While our boss is on vacation, Bob will call the shots.

go overboard His sailing instructor fell overboard and drowned during a lesson.

You can't believe everything Janice says about Rick. She tends to go overboard when she's complaining about him.

skate on thin ice（walk on thin ice）

You're skating on thin ice if you do not send out your university applications now.

take a rain check ‘Can I take a rain check?—I must get this finished tonight.’

play by the rules

I like my boss. He plays by the rules.

make the cut

I didn't get a second interview, so I'm pretty sure I won't make the cut.