What does priority mean in surfing?

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Tags

1. #first
2. #hands
3. #stand
4. #surfers
5. #surfer
6. #attempt
7. #colored
8. #catch
9. #edges
10. #event
11. #loses
12. #discs
13. #surfboard
14. #their
15. #rails
16. #leave
17. #indicated
18. #priority
19. #lineup