What is the most famous idiom?

Here is the list of Top Ten Idiomatic Expressions according to the "Official Top List" website (link below)

1. Piece of Cake (meaning easy)
2. Under the Weather (meaning not feeling well)
   
3. Rise and Shine (meaning get up and get moving)
4. Keep your chin up (meaning be brave)
   
5. Tickled Pink (meaning flushed with happiness)
6. Butterflies in your stomach (meaning nervous)
7. Bend over backwards (meaning to do everything possible for a solution)
   
8. In the same boat (meaning everyone has the same situation)
   
9. End of the road (meaning it's over)
   
10. Break a leg (meaning good luck in the theater)