Webster's Revised Unabridged Dictionary · 1913

Leer

Leer (lēr) , transitive verb

To learn. [Obsolete]

Leer , adjective

[Old English lere; akin to German leer, Old High German & Old Saxon lāri.]

Empty; destitute; wanting
(a)
Empty of contents.
(b)
Destitute of a rider; and hence, led, not ridden; as, a leer horse.
(c)
Wanting sense or seriousness; trifling; trivolous; as, leer words. [Obsolete or Provincial English] — B. Jonson
A leer stomach. — Gifford

Leer , noun

An oven in which glassware is annealed.

Leer , noun

[Old English lere cheek, face, look, Anglo-Saxon hleór cheek, face; akin to Old Saxon hlear, hlior, OD. lier, Icelandic hlȳr.]

1.
The cheek. [Obsolete] — Holinshed
2.
Complexion; aspect; appearance. [Obsolete]
A Rosalind of a better leer than you. — Shakespeare
3.
A distorted expression of the face, or an indirect glance of the eye, conveying a sinister or immodest suggestion.
With jealous leer malign Eyed them askance. — Milton
She gives the leer of invitation. — Shakespeare
Damn with faint praise, assent with civil leer. — Pope

Leer (lērd) , intransitive verb

To look with a leer; to look askance with a suggestive expression, as of hatred, contempt, lust, etc.; to cast a sidelong lustful or malign look.
I will leerupon him as a' comes by. — Shakespeare
The priest, above his book, Leering at his neighbor's wife. — Tennyson

Leer , transitive verb

To entice with a leer, or leers; as, to leer a man to ruin. — Dryden