Leer \Leer\, v. i. [imp. & p. p. {Leered} (l[=e]rd); p. pr. & vb. n. {Leering}.] 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. --Shak. The priest, above his book, Leering at his neighbor's wife. --Tennyson.