Sorry, no online dictionaries contain the exact phrase grinning like an idiot.
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Reverse dictionary results:
1. smirking
2. beaming
3. smiling
4. laughing
5. gloating
6. smirky
7. glib
8. grimace
9. grin
10. grinning
11. half smile
12. smile
13. smiley
14. smilie
15. smirk
16. snarky
17. snarlingly
18. sneering
19. sneery
20. frowner
21. glozing
22. grimacing
23. grinny
24. irrision
25. lippy
26. mow
27. pout
28. pouting
29. pouty
30. sarky
31. scoffing
32. scowl
33. scowling
34. snark
35. sneerful
36. snelly
37. snipey
38. wincing

You can look up the words in the phrase individually using these links:   grinning ?   like ?   an ?   idiot ?
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Not helpful? You might try using the wildcards * and ? to find the word you're looking for. For example, use
grin*to search for words beginning with grin, or
*diotto search for words ending with diot
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