expression, ichidan verb
frown; knit one's brows; squint
Describes the action of drawing the eyebrows together, typically expressing worry, displeasure, or concentration. Often used in the form 眉根を寄せて.
彼は難しい本を読みながら眉根を寄せた。
He frowned while reading a difficult book.
彼女は眉根を寄せて、不満そうな顔をした。
She knitted her brows and looked displeased.