1. He is a fool of the first water.
2. The business was over in two-twos.
3. We must put two and two together.
4. The shirts are second to none in the shop.
5. He is a second-storey man.
6. The fellow is a third ear.
7. The film seems to have a third dimension.
8. The novel is full of four-letter words.
9. The poor old man seems to be a fifth wheel in the family.
10. I asked my wife many questions, but she took the fifth.
11. They are six of one and half a dozen of the other.
12. We are behind the eight ball.
13. It's only a nine day's wonder.
14. He took ten and went on working.
15. They belong to the upper ten.
16. His boss is a ten-minute man.
17. You'll strike twelve if you study hard.
18. She talked nineteen to the dozen.
19. He is running like sixty.
20. She thinks her husband is a man in a million / thousand.