What does it mean to Mulligan in Hearthstone?

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Tags

1. #usually
2. #stroke
3. #meaning
4. #rules
5. #though
6. #allowed
7. #known
8. #wrong
9. #second
10. #perform
11. #blunder
12. #mulligan
13. #player
14. #after
15. #replay
16. #through
17. #against
18. #first
19. #whereby
20. #action
21. #informally
22. #formal
23. #chance