Definition of leers:
(v) :
(intransitive) To look sideways or obliquely; now especially with sexual desire or malicious intent.
(v) :
(transitive) To entice with a leer or leers.
(n) :
A significant side glance; a glance expressive of some passion, as malignity, amorousness, etc.; a sly or lecherous look.
(n) :
An arch or affected glance or cast of countenance.
(n) :
(UK dialectal) The flank or loin.
(n) :
(obsolete) The cheek.