to bring your eyebrows together so that there are lines on your face above your eyes, often while turning the corners of your mouth downwards, showing that you are annoyed, worried, sad, or thinking hard
Melissa frowned when she found out that the party had been cancelled.
The teacher's frown signaled disapproval of the disruptive behavior.
He couldn't help but frown when he heard the disappointing news.
Deep in thought, she began to frown as she considered the complex problem.
A collective frown appeared on the faces of the audience during the confusing presentation.
