Deepen

Part of speech: verb (v.)

1. To make deep or deeper; to increase the depth of; to sink lower; as, to deepen a well or a channel. It would . . . deepen the bed of the Tiber. Addison.

2. To make darker or more intense; to darken; as, the event deepened the prevailing gloom. You must deepen your colors. Peacham.

3. To make more poignant or affecting; to increase in degree; as, to deepen grief or sorrow.

4. To make more grave or low in tone; as, to deepen the tones of an organ. Deepens the murmur of the falling floods. Pope.

Part of speech: verb (v.)

To become deeper; as, the water deepens at every cast of the lead; the plot deepens. His blood-red tresses deepening in the sun. Byron.