眉头一皱,计上心来 meaning in English

Knit the brows and you will hit upon a stratagem.A ruse grew up behind the knitted brows above one's eyebrows.As he frowns thoughtfully,an idea strikes him.frowned in thought and at last thought of a plan.He tightly knit his brows in a frown and at last a plan was born in his heart.Knit the brows and a stratagem comes to mind.The brain behind the knitted brow conceived a plan.