Believe You Me Meaning

(idiomatic) An emphatic form of "believe me"; you [the subject] had better believe me [the speaker].

Example: 1841, Caesar Otway, Sketches in Erris and Tyrawly, by the author of 'Sketches in Ireland ..., p. 185:
  Well, sir, believe you me, I'll give that lassy as good a strapping as ever she got when she comes back.
1870, Garland, In re Garland, p. 94:
  But many a time, believe you me, I bought a rabbit from you, when I could put something else in the pot...
1877, Justin McCarthy, Miss Misanthrope: A Novel, p. 21:
  That's change, if you like to call it so. But the heart of things is just the same. Balzac stands for Paris, believe you me.
1887, Alexander Wardrop, Mid-Cauther Fair: A Dramatic Pastoral : with Other Poems, Songs, and Prose, p. 113:
  But, Sandy lad, believe you me, I loe ye like a brither!
1912, George A. Birmingham, The Simpkins Plot, p. 75:
  "Believe you me," said Meldon, " she'll know how to manage him."