Piece of cake!
It means something is easy.
Under the weather
It means you look or feel sick.
The early bird catches the worm.
It means, if you want to succeed, you must wake up early.
Break a leg
It means good luck!
It's raining cats and dogs!
It means it is raining a lot!
Fingers crossed!
It means good luck.
Don't judge a book by its cover.
It means we should not judge others by their appearance.
Two heads are better than one.
It means we can solve a problem easily by working together.
Long face
It means you look sad.
Not my cup of tea.
It means it's not my style.