English

Verb

deepening

1. present participle of deepen

Noun

deepening ‎(plural deepenings)

1. The act of becoming deeper.
   • 1972, H. H. Lamb, Climate: Present, Past and Future (volume 1, page 408)

     Further examples of the same effect could be seen in sudden deepenings of depressions over the warmer than normal eastern Atlantic in the 1968-9 winter: the consequence was interruptions of the cold weather prevailing in Britain […]