As a Noun:
1. The activity in which you go under water, usually in the sea, using special breathing equipment for pleasure or work.
2. A person who goes deep sea diving for pleasure or work. English = diver, deep sea diver, scuba diver.
As a Verb or Adjective:
1. To go under water, usually in the sea, using special breathing equipment for pleasure or work. English = dive, go deep sea diving, go scuba diving.