sneak peek
Peek. You are looking, not climbing a mountain.
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Wrong: Here’s a sneak peak.
Right: Here’s a sneak peek.
You’re looking at something. Peek—and it has two Es, like see.
The mnemonic
P-EE-K has two Es, like s-ee. Both are about looking.
Peak is a summit—the peak of a mountain, peak traffic, peak season.
Why it’s everywhere
This one shows up constantly in marketing copy, where “sneak peek” is a standard phrase and the writer is moving fast. Spellcheck won’t catch it because peak is a perfectly good word, so it ships to the whole mailing list.
Now go take a look. Two Es.