(n) :
the wrinkling of the brows or face in frowning; the expression of displeasure, sullenness, or discontent in the countenance; an angry frown; hence, gloom; dark or threatening aspect
(v) :
to wrinkle the brows, as in frowning or displeasure; to put on a frowning look; to look sour, sullen, severe, or angry; hence, to look gloomy, dark, or threatening; to lower
(n) :
the wrinkling of the brows or face in frowning; the expression of displeasure, sullenness, or discontent in the countenance; an angry frown; hence, gloom; dark or threatening aspect
(v) :
to wrinkle the brows, as in frowning or displeasure; to put on a frowning look; to look sour, sullen, severe, or angry; hence, to look gloomy, dark, or threatening; to lower