The furrows between his brows deepened.
The origin of insect wings remains, therefore, a mystery, deepened by the difficulty of imagining any probable use for thoracic outgrowths, comparable to the wingrudiments of the Exopterygota, in the early stages of their evolution.
Now half the bed of the river has been walled over for the metropolitan railway, while the other half has been deepened, and the portion of it within the town has been arched over.
He believed that language unified and deepened community.
His frown deepened into a scowl and then he rolled over, turning his back to her.
