knit one's brows , also: knit one's eyebrows

But the young man knit his brows and said no word in answer.

She walked up to the bed, concern knitting her brow.

She looked out the window and knit her own perfect brows.

The man knitted his brows and thought hard for a minute or so.

He knit his smooth brow in an expression of concern.

Then I stood there knitting my brows over the two messages.

His brows knitted for a moment, then relaxed in decision.

He knitted his brows like one who encounters a problem.

"I do not recall the name," said the woman, knitting her brows in thought.

She knit her brows and looked at him with a puzzled expression.