LOUR
frown, glower, lour, lower
(verb) look angry or sullen, wrinkle one’s forehead, as if to signal disapproval
lower, lour
(verb) set lower; “lower a rating”; “lower expectations”
Source: WordNet® 3.1
Etymology
Verb
lour (third-person singular simple present lours, present participle louring, simple past and past participle loured)
(intransitive) To frown; to look sullen.
Synonyms: glower, scowl
(intransitive, figuratively) To be dark, gloomy, and threatening, as clouds; of the sky: to be covered with dark and threatening clouds; to show threatening signs of approach, as a tempest.
Noun
lour (plural lours)
A frown, a scowl; an angry or sullen look.
(figuratively) Of the sky, the weather, etc.: a dark, gloomy, and threatening appearance.
Synonyms: gloom, gloominess
Source: Wiktionary
Lour, n. Etym: [Native name.] (Zoöl.)
Definition: An Asiatic sardine (Clupea Neohowii), valued for its oil.
Source: Webster’s Unabridged Dictionary 1913 Edition