Sorry, no online dictionaries contain the exact phrase to increase in efficacy.
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Reverse dictionary results:
1. efficiency
2. force
3. forces
4. weight
5. charm
6. effect
7. effectiveness
8. virtuate
9. avail
10. available
11. availing
12. cefotaxime
13. degradation
14. empower
15. stultify
16. vain
17. adjuvant
18. amplify
19. counterpoise
20. cumulative
21. develop
22. enhance
23. exalt
24. exalting
25. exercise
26. fertilizer
27. flourish
28. follow
29. follow up
30. followup
31. fortified
32. fortify
33. heat
34. het
35. induce
36. inducing
37. leverage
38. locomotive
39. mak
40. make

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