What does the saying don't flatter yourself mean?

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Tags

1. #aspect
2. #warranted
3. #doesn
4. #yourself
5. #other
6. #puffing
7. #order
8. #typically
9. #highly
10. #means
11. #someone
12. #person
13. #saying
14. #lying
15. #another
16. #better
17. #themselves
18. #exaggerating