the.com/frown
The face's way of leaking your opinion before your mouth gets clearance.
means A facial expression of displeasure, worry, or concentration, made by furrowing the brow and turning the mouth down.
from From Old French frognier, to snort or turn up the nose in scorn — disdain that migrated south to the mouth.
Muscle countFrowning recruits more muscles than a casual smile.
Brow signalThe furrowed forehead often outshouts the downturned mouth.
Botox studyParalyzing frown muscles measurably eased some people's depression.