Hello Guest I'm an English learner from Japan. Could you allow me to try to answer your question? I think 'sneak peak' is a phrase born by misspelling 'sneak peek' (stealthy quick look).
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AnonymousHe told me that I am wrong and that sneak peak and sneak peek are interchangeable according to Cambridge dictionary.He doesn't know how to use a dictionary. I just looked at the Cambridge dictionary on-line and the only definition of "peak", the noun is "the pointed top of a mountain, or the mountain itself". I can't see how a quick look at