Idiom of the day :- Knit one’s brows

Usage, examples and definition of the Idiom :-

As you might have noticed, Mr. Singh is in deep thought. You can tell because he is knitting his brows. Brows are one’s forehead or eyebrows, and to knit one’s browsis to wrinkle them while thinking. ‘I’m knitting my brows trying to solve a problem,’ Mr. Singh said.