A quick glance or look.
"The engineer selected PEK as a high-performance thermoplastic for manufacturing the aircraft's heat-resistant components."
Misspelling of pique.
Acronym of polyetheretherketone.
In plain English: A peek is just taking a quick, secret look at something without being seen doing it.
"The child's curious peek showed that she was watching us from behind the door."
To look slyly, or with the eyes half closed, or through a crevice; to peep.
"She peeked out from behind the curtain to see who was knocking at the door."
In plain English: To peek means to look at something quickly and secretly without being seen.
"She quickly peeked under her blanket to check if anyone was coming in."
Usage: Use "peek" primarily in informal contexts rather than formal writing, where "peep" may be preferred for its slightly more literary tone. Avoid using it as a noun (e.g., "a peek") if you intend to sound strictly traditional, though this usage is now widely accepted in casual speech.
A surname.
"Mr. Peek waved from his garden as he walked down the street."
The word "peek" likely originated as a fusion of two Old English words meaning to peep and to spy. It may have also developed through a rearrangement of sounds from an earlier form that meant to keep or watch closely.