Sorry, no online dictionaries contain the exact phrase sit up straight.
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Reverse dictionary results:
1. posture correctly
 2. maintain good posture
3. sit erect
4. sit tall
5. sit up properly
6. come
7. upright
8. address
9. set
10. stand
 11. standing
12. slouch
13. rectify
14. beg
15. rocket
16. awake
17. recover
18. sat
19. cheongsam
20. roach
 21. straighten
22. erect
23. vertical
24. unbend
25. dried
26. dry
27. lied
28. live
29. net
30. perpendicular
 31. pure
32. sec
33. sect
34. how
35. leap
36. serious
37. tower
38. wake
39. await
40. recovering

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You can look up the words in the phrase individually using these links:   sit ?   up ?   straight ?
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