What does the idiom "barking up the wrong tree" mean?

Making a mistake or pursuing the wrong course of action.

What does the idiom "piece of cake" mean?

What does the idiom "cost an arm and a leg" mean?

What does the idiom "let the cat out of the bag" mean?

 What does the idiom "raining cats and dogs" mean?

Strange weather with animals falling from the sky.

What does the idiom "hit the nail on the head" mean?

What does the idiom "break the ice" mean?

What does the idiom "spill the beans" mean?

What does the idiom "under the weather" mean?