1. Once in a blue moon
2. A piece of cake
3. On the level, to level with someone
4. Time flies
5. To be raining cats and dogs
6. To spill the beans
7. To be on top of the world
8. To be on Cloud Nine
9. To have a Close Shave
10. To keep your head above water
11. To split hairs
12. To have a lot on your plate
13. To cut the mustard
14. To jump to conclusions
15. A hard pill to swallow
16. To be out on a limb
17. To turn over a new leaf
18. To sit on the fence
19. Not my cup of tea
20. To be up in the air
21. With a grain of salt
22. To be on thin ice
23. On the back burner
24. At the drop of a hat
25. Can't see the wood for the trees
26. To have a chip on your shoulder
27. To come out of your shell
28. The elephant in the room
29. To sleep on it
30. To be on tenterhooks
31. To be in a pickle
32. To fly off the handle
