Sorry, no online dictionaries contain the exact phrase raise a red flag.
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Reverse dictionary results:
1. alert
2. warn
3. signal
4. indicate
5. notify
6. backstop
7. mount
8. alarum
9. lead
10. screen test
11. warning sign
12. locomotion
13. brassboard
14. call-out
15. field test
16. high sign
17. road test
18. stage right
19. staging post
20. test bed
21. test flight
22. testing ground
23. cross
24. curtain raiser
25. front line
26. platform
27. proving ground
28. tick
29. tie-in
30. trial run
31. upstage
32. backflash
33. danger signal
34. flyer
35. revolving door
36. road-test
37. rotation

You can look up the words in the phrase individually using these links:   raise ?   a ?   red ?   flag ?
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Not helpful? You might try using the wildcards * and ? to find the word you're looking for. For example, use
rais*to search for words beginning with rais, or
*flagto search for words ending with flag
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