Sorry, no online dictionaries contain the exact phrase as serious as a heart attack.
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Reverse dictionary results:
1. stroke
 2. affect
3. attacks
4. strike
5. die
6. assault
7. grave
8. severe
9. charged
10. charging
 11. pale
12. pales
13. true
14. influenza
15. burn
16. leak
17. negative
18. throw
19. thunderbolt
20. intensity
 21. break
22. lead
23. diamond
24. important
25. charge
26. gaa
27. gas
28. round
29. rounds
30. sink
 31. essen
32. tension
33. trespass
34. well
35. coronary
36. siege
37. seizure
38. cardiac arrest
39. defibrillate
40. silent

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You can look up the words in the phrase individually using these links:   as ?   serious ?   as ?   a ?   heart ?   attack ?
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