Sorry, no online dictionaries contain the exact phrase to clam up.
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Reverse dictionary results:
1. be quiet
2. shut up
3. stop talking
4. remain silent
5. refuse to speak
6. shut
7. clams
8. dummy
9. seashell
10. bake
11. clamp
12. dip
13. foot
14. maid
15. neck
16. shell
17. shore
18. clem
19. grab
20. grabbing
21. happy
22. bucking
23. augment
24. cheer
25. courage
26. earth
27. earthed
28. earthing
29. elate
30. farm girl
31. hearten
32. heidi
33. lana
34. level
35. mum
36. mute
37. part
38. patt
39. punk
40. reassure

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You can look up the words in the phrase individually using these links:   to ?   clam ?   up ?
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to c*to search for words beginning with to c, or
*m upto search for words ending with m up
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