Available Definitions:
1) v. i. - To wrinkle the brows, as in frowning or displeasure; to put on a frowning look; to look sour, sullen, severe, or angry.
2) v. i. - Hence, to look gloomy, dark, or threatening; to lower.
3) v. t. - To look at or repel with a scowl or a frown.
4) v. t. - To express by a scowl; as, to scowl defiance.
5) n. - The wrinkling of the brows or face in frowing; the expression of displeasure, sullenness, or discontent in the countenance; an angry frown.
6) n. - Hence, gloom; dark or threatening aspect.