to frown is a form of:

Frown



noun
1.
(a wrinkling of the brow to express disapproval) ការចងចិញ្ចើម
verbpast tense: frowned ; past participle: frowned ; present participle: frowning ;
1.
(INTRANSITIVE) ~ (at somebody / something) (to contract the brows, to show disapproval, to wrinkle the brow) frown at a child ចងចិញ្ចើមដាក់ frown on មិនយល់ព្រម
ENGLISH MEANING
noun
1.
A wrinkling of the face in displeasure, rebuke, etc.; a sour, severe, or stere look; a scowl.
2.
Any expression of displeasure; as, the frowns of Providence; the frowns of Fortune.
verbpast tense: frowned ; past participle: frowned ; present participle: frowning ;
1.
(INTRANSITIVE) To contract the brow in displeasure, severity, or sternness; to scowl; to put on a stern, grim, or surly look.
2.
(INTRANSITIVE) To manifest displeasure or disapprobation; to look with disfavor or threateningly; to lower; as, polite society frowns upon rudeness.
3.
(TRANSITIVE) To repress or repel by expressing displeasure or disapproval; to rebuke with a look; as, frown the impudent fellow into silence.