An emphatic form of believe me: you (the subject) had better believe me (the speaker).
Adam and Eve
[Cockney slang]believe
believe it or not
This may be surprising, but it's true.
believe one's ears
To believe that something which one hears is truly the case.
believe one's eyes
To believe that something which one directly sees is truly the case.
make believe
To pretend or imagine.
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