In a sentence: I'm planning a surprise holiday for Liam to celebrate our wedding anniversary. Don’t let the cat out of the bag!

Let the cat out of the bag Meaning (a)  

In a sentence: I know he looks scary, but my dog is really gentle. You can’t judge a book by its cover.

Judge a book by its cover Meaning (a)  

In a sentence: I hope the performance goes well, Adam. Break a leg!

Break a leg Meaning (a)  

In a sentence: Ayano was feeling under the weather, so she left work early.

Under the weather Meaning (a)  

In a sentence: Maddy caught the train by the skin of her teeth. It left a few seconds later.

By the skin of your teeth Meaning (a)  

In a sentence: I’m so glad I ordered an extra large pizza. I could eat a horse!

I could eat a horse Meaning (a)  

In a sentence: I wish my boss would stop beating around the bush and tell me what he really thinks of my product idea.

Beat around the bush Meaning (a)  

In a sentence: Huan only cooks at home once in a blue moon.

Once in a blue moon Meaning...

(a)  

In a sentence: Jamal had butterflies in his stomach as he waited for his date outside the restaurant.

Have butterflies in your stomach Meaning (a)  

In a sentence: Debbie’s a tough cookie. She doesn’t mind when people criticise her work.

A tough cookie Meaning (a)  

In a sentence: I’m glad my boss and I see eye to eye about recycling in the office.

See eye to eye Meaning (a)  

In a sentence: My new suit cost an arm and a leg. I bought it in Milan.

Cost an arm and a leg Meaning (a)  

In a sentence: Megan stole my thunder when she told the professor the result of my experiment.

Steal someone’s thunder Meaning (a)