What does the Keep Calm mean?

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Tags

1. #cities
2. #attacks
3. #raise
4. #poster
5. #government
6. #motivational
7. #morale
8. #british
9. #intended
10. #widely
11. #public
12. #preparation
13. #threatened
14. #world
15. #produced
16. #predicted
17. #carry
18. #major