Etymology
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leer (v.)

1520s, "to look obliquely" (since 18c. usually implying a lustful, wolfish, malicious intent), probably from Middle English noun ler "cheek," from Old English hleor "the cheek, the face," from Proto-Germanic *hleuza- "near the ear," from *hleuso- "ear," from PIE root *kleu- "to hear." If so, the notion is probably of "looking askance" (compare the figurative development of cheek). Related: Leered; leering.

leer (n.)

"a significant glance, amorous or malign or both," 1590s, from leer (v.).

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Definitions of leer
1
leer (n.)
a facial expression of contempt or scorn; the upper lip curls;
Synonyms: sneer
leer (n.)
a suggestive or sneering look or grin;
2
leer (v.)
look suggestively or obliquely; look or gaze with a sly, immodest, or malign expression;
The men leered at the young women on the beach
From wordnet.princeton.edu