Sorry, no online dictionaries contain the exact phrase heads up and knowledge.
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Reverse dictionary results:
1. background
2. get
3. mind
4. recall
5. smart
6. catch
7. notice
8. info
9. toss
10. attention
11. grab
12. rub
13. cover
14. covers
15. intelligence
16. pick
17. alert
18. warning
19. capitulate
20. fore
21. memo
22. focus
23. care
24. warn
25. watch
26. recapitulate
27. beware
28. careful
29. carefully
30. catches
31. catching
32. caught
33. caution
34. danger
35. hark
36. heed
37. incoming
38. timber
39. trot
40. trots

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You can look up the words in the phrase individually using these links:   heads ?   up ?   and ?   knowledge ?
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Not helpful? You might try using the wildcards * and ? to find the word you're looking for. For example, use
head*to search for words beginning with head, or
*edgeto search for words ending with edge
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