This is an error I see all the time: “Get a sneak peak at the trailer for New Moon!” (Here’s an example from a source that should know better.) The correct spelling is “sneak peek.” A peek is a brief glance, while a peak is a high point. I think most people know the difference, but get subconsciously thrown by the spelling of “sneak.” “Sneak peak” looks cooler, but sadly, it’s wrong. Copy editors are such killjoys.
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