f. derinleşmek; koyulaştırmak. The water deepens around here. (Buralarda su derinleşiyor.)

To make deep or deeper; to increase the depth of; to
sink lower; as, to deepen a well or a channel.

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

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

To make more grave or low in tone; as, to deepen the
tones of an organ.

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