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peek (v.)

late 14c., piken "look quickly and slyly," a word of unknown origin. The words peek, keek, and peep all were used with more or less the same meaning 14c.-15c.; perhaps the ultimate source was Middle Dutch kieken. Related: Peeked; peeking.

peek (n.)

"a peek, glance," 1844, from peek (v.).

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Definitions of peek from WordNet
1
peek (v.)
throw a glance at; take a brief look at;
I only peeked--I didn't see anything interesting
Synonyms: glance / glint
2
peek (n.)
a secret look;
Synonyms: peep
From wordnet.princeton.edu