To furrow your brow is to draw the forehead into lines in worry. Furrow your brow over the letter.
It happens without any decision, which is why it gives so much away. To furrow your brow takes its name from the ploughed lines the forehead makes.
1phrasefurrow your browTo draw the forehead into lines in worry.
“You could see him furrow your brow over the same paragraph twice.”
furrow your brow is a gesture.
Practised in Body Language & Gestures