a cut above
better than the others in this subject/field

– examples

Quite simply, he is a cut above the rest. There isn’t anyone who can do what he is doing.

When it comes to flower arranging, Dave is a cut above.

cut from a different cloth
1 -superior; better, and always has been from birth
2- totally different

– examples

She has been jealous of her sister all her life; it is like they are cut from different cloth.

In life there are people who, sadly, are simply cut from a different cloth. They’re smarter, better looking, and seem to stroll to success. I wish I was one of those people.

“How about Vicky? I like her.”
“Dave, when it comes to choosing women we’re cut from a different cloth.’

the cat is out of the bag
the secret is out and no longer a secret

– examples

For six months he didn’t tell them anything, working away quietly. One Monday, however, Vicky saw him coming home from the dance school and the cat was out of the bag.

“I’m afraid the cat is out of the bag on your little secret: we all know you have been dating Dave’s girlfriend. You should be careful.”

(set) a cat amongst the pigeons
for a thing (usually a new thing) to disturb the normal. This can be bad (causes trouble) or by choice (because people were getting lazy)

– examples

“The employees have been getting a bit over-confident really. They don’t seem to want to do anything, and if I tell them they have to they don’t listen.”
“I tell you what: start a rumour that somebody is getting fired on Friday. That should set the cat amongst the pigeons.”

The boss is quite happy that Dave has upset a few people: he thought he needed to set a cat amongst the pigeons to wake a few of them up.

champing at the bit
(also ‘chomping at the bit’)
Really eager to start doing an activity

– examples

I’m champing at the bit to get started on the project.

Investors are champing at the bit to put their money into this website.

(your) call
equal to “you decide”

– examples

The weather was getting worse. Anna told Dave that it was his call whether they continued or not.

“What do you want to do? Head out, or shall we order in some pizza?”
“I don’t mind. It’s your call.”

(it) costs an arm and a leg
to cost a lot of money; to be very very expensive

– examples

“I’d like to go home for Christmas, but the tickets cost an arm and a leg. Maybe I’d be smarter to wait until January.”

(it) costs the earth
to cost a lot of money; to cost a very large sum of money

– examples

He is looking for a wedding present that doesn’t cost the earth.