He screwed his face up with a slight frown, signaling that he didn't understand.
From the ocregister.com
Sometimes the gods not only don't smile on the candidates, they downright frown.
From the sacbee.com
Just talking about red tide made the turtle volunteers frown and rub their arms.
From the heraldtribune.com
What happens when people have Botox faces that can't smile, frown, or get angry?
From the blogs.psychcentral.com
His black hair is cut close to his scalp, his forehead creased with frown lines.
From the guardian.co.uk
For the same reasons, many orthodox religions frown upon leg crossing in church.
From the nzherald.co.nz
I was sitting backstage with a frown on my face, which is very, very rare for me.
From the newsweek.com
The face of the franchise has had a nearly permanent frown the past seven days.
From the denverpost.com
You frown and everybody is going to know you made a mistake.'I was too serious.
From the kentucky.com
More examples
A facial expression of dislike or displeasure
Look angry or sullen, wrinkle one's forehead, as if to signal disapproval
(frowning) showing displeasure or anger
A facial expression in which the eyebrows are brought together, and the forehead is wrinkled, usually indicating displeasure, sadness or worry, or less often confusion or concentration; To have a frown on one's face
Straight razors where the edge isn't straight, but where the width of the blade is narrower in the middle than at the ends is said to have a frown (because of the frown shape it will have when held in front of you).
Refers to the "mouth" on the trooper helmet.
(also frowning edge) When the edge of the razor is concaved towards the spine of the razor, making it appear like a frown. Opposite of a smile. Frowns should be removed before honing the razor.