To knit one's brows in thought, and suddenly a clever plan or solution comes to mind.
面对突如其来的挑战，他眉头一皱，计上心来，很快便找到了突破口。
Faced with a sudden challenge, he knitted his brows, and a clever plan came to mind, quickly finding a breakthrough.
Next Idiom
To knit one's brows in thought, and suddenly a clever plan or solution comes to mind.