What does 1st & 10 mean in football?

Related questions

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4. How was football invented?
5. Who is the current world champion in soccer?
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Tags

1. #total
2. #usually
3. #right
4. #first
5. #definition
6. #which
7. #possession
8. #start
9. #football
10. #downs
11. #within
12. #giving
13. #yards
14. #series
15. #retain