DEEPENING
deepening
(noun) a process of becoming deeper and more profound
Source: WordNet® 3.1
Verb
deepening
present participle of deepen
Noun
deepening (plural deepenings)
The act of becoming deeper.
Source: Wiktionary
DEEPEN
Deep"en, v. t. [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. 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.
Deep"en, v. i.
Definition: 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.
Source: Webster’s Unabridged Dictionary 1913 Edition