"to look obliquely" (now usually implying "with a lustful or malicious intent"), 1530, from M.E. noun ler "cheek," from O.E. hleor "the cheek, the face," from P.Gmc. *khleuzas "near the ear," from *kleuso- "ear," from PIE root *kleu- "to hear" (see
listen). The notion is
probably of "looking askance" (cf. figurative development of cheek). The noun is first attested 1598.