Deepen /(?)/

imp. & p. p. Deepened; p. pr. & vb. n. Deepening

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.

2. To make darker or more intense; to darken; as, the event deepened the prevailing gloom.

   You must deepen your colors.

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.

1. To become deeper; as, the water deepens at every cast of the lead; the plot deepens.

   His blood-red tresses deepening in the sun.