Euche (yoo’-kay): A vow to keep a promise.
YOU: I promise you that I’ll promise you.
ME: Promise me what?
YOU: That I’ll keep the promise I made to you.
ME: Isn’t keeping a promise implied by making a promise?
YOU: I promise, I don’t know.
ME: Goodbye! That’s a promise!
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Definition courtesy of “Silva Rhetoricae” (rhetoric.byu.edu).