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You can believe or trust me. A: "Are you sure you know what you're doing?" B: "Of course I do—trust me!" A: "This won't really make me look younger, will it?" B: "Oh, it absolutely will. Trust me!"
I am telling you the truth. Please believe me. Tom said with great conviction, "Trust me! I know exactly what to do!" Mary: Do you really think we can keep this party a secret until Thursday? Sally: Trust me! I know how to plan a surprise party.
exclam. Believe me!; Honestly! He actually said it just like Tom told you. Trust me!