Sorry, no online dictionaries contain the exact phrase dead in a heartbeat.
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Reverse dictionary results:
1. dicrotic
2. electrocardiogram
3. heart failure
4. heartthrob
5. pacemaker
6. pulse
7. tachycardia
8. throb
9. flatline
10. murmur
11. thump
12. ballistocardiograph
13. crisis
14. depressor
15. ecg
16. erratic
17. stethoscope
18. sympathetic
19. beats
20. breathless
21. dying
22. inanimate
23. pelt
24. pulseless
25. right
26. sea
27. abate
28. abating
29. ache
30. aerobic
31. alabama
32. antiarrhythmic
33. aorta
34. arteria
35. arterial blood vessel
36. artery
37. astral
38. backstroke
39. bangle
40. bate

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You can look up the words in the phrase individually using these links:   dead ?   in ?   a ?   heartbeat ?
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