Why is it called a switchblade?

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Tags

1. #called
2. #functions
3. #spring
4. #opening
5. #handle
6. #button
7. #mechanism
8. #because
9. #tension
10. #engages
11. #knife
12. #switchblade
13. #second
14. #blade
15. #front
16. #releases
17. #comes