How do you use super in Cuphead?

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Tags

1. #currently
2. #defeating
3. #equipped
4. #progressing
5. #allow
6. #button
7. #forward
8. #shoot
9. #cards
10. #press
11. #bosses
12. #extremely
13. #whatever
14. #super
15. #meter
16. #completely
17. #helpful
18. #cuphead