I am listening and you have my attention. What's the idiom?

The dad bought the son a brand new car. The son is feeling on top of the world! What does the idiom mean?

The boy asked his mom if he can buy a video game. He said "please mom it's dirt cheap!" Dirt cheap. What does this idiom mean?

I wanted to go to the park with my friends, but I was all tied up at work. All tied up. What does this idiom mean?

It is raining heavily. What is the idiom?

Someone good at gardening. What is the idiom?

The boy would not stop talking in class. The boy was in hot water with his teacher. In hot water. What does this idiom mean?

Something that is very cheap. What is the idiom?

Break a leg. What does this idiom mean?

I am very busy. What is the idiom?

The girl got a bad grade on her test so she's feeling down in the dumps. Down in the dumps. What does this idiom mean?

We are throwing Ms. Nelson a suprise birthday party in class. Dont't tell Ms. Nelson and let the cat out of the bag. Don't let the cat out of the bag. What does this idiom mean?

To be quiet. What is the idiom?