Knit her brow - Idioms by The Free Dictionary
knit (one's) brow(s) (redirected from knit her brow)
knit (one's) brow(s)
To furrow one's brow, often due to worry or confusion. Whenever there was a problem, my dad would sit in his favorite chair, knit his brow for a while, and then announce that he had a plan. When I asked Bill about what happened, and he knit his brows, I knew I was about to hear some bad news.
knit one's brow
to cause one's brow to wrinkle. Bob knitted his brow when he was confused. Jane knitted her brow because she was angry.
knit your ˈbrows frown (= move your eyebrows together), to show that you are thinking hard, feeling angry, etc: She knitted her brows, trying to think how she could have spent so much money in one week.
References in classic literature
Naturally wondering what the letter might contain, I watched her countenance while she read it, and was somewhat surprised to see her bite her lip and knit her brows
as if in anger.
O'Leary knit her brow
and in a voice full of empathy replied, "Let me sit with you and let's see what I can honestly commit to you, and we'll work this.