Why are chocks called chocks?

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Tags

1. #setting
2. #material
3. #coated
4. #against
5. #placed
6. #wheels
7. #chocks
8. #wheel
9. #sometimes
10. #ground
11. #brakes
12. #movement
13. #addition
14. #enhance
15. #sturdy
16. #rubber
17. #accidental
18. #prevent
19. #safety
20. #vehicle
21. #closely
22. #bottom
23. #surface
24. #wedges