Sorry, no online dictionaries contain the exact phrase speed up efficiently.
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Reverse dictionary results:
1. expedite
2. expedited
3. streamline
4. rev
5. slow
6. hold
7. hasten
8. accelerate
9. hurry
10. accelerated
11. accelerating
12. hastening
13. accelerates
14. faster
15. gun
16. hie
17. quicken
18. acc
19. blast
20. burn
21. chicane
22. cloture
23. fortran
24. give
25. guns
26. increase
27. increasing
28. intensified
29. intensify
30. loans
31. mineralize
32. pace
33. press
34. quickened
35. ready
36. slowing
37. spur
38. step up
39. turn
40. turned

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