DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   leer
       n 1: a facial expression of contempt or scorn; the upper lip
            curls [syn: sneer, leer]
       2: a suggestive or sneering look or grin
       v 1: look suggestively or obliquely; look or gaze with a sly,
            immodest, or malign expression; "The men leered at the
            young women on the beach"