intransitive verb

1. to contract the brows, as in displeasure or concentrated thought
2. to look with displeasure or disapproval (on or upon)

Etymology: ME frounen < OFr frognier < froigne, sullen face < Gaul *frogna, nostrils, akin to OIr srón, nose

transitive verb

1. Now Rare to silence, subdue, etc. with a disapproving look
2. to express (disapproval, disgust, etc.) by frowning

noun

1. a contracting of the brows in sternness, thought, etc.
2. any expression of displeasure or disapproval