D defs.my
Entry 1 sense Webster, 1913

Peek

/(pēk)/ · IPA /piːk/
01 v. i. To look surreptitiously, or with the eyes half closed, or through a crevice; to peep.
  1. 1.
    To look surreptitiously, or with the eyes half closed, or through a crevice; to peep.[Colloq.]