The action or sport of swimming underwater without a deep-sea diving suit (originally, naked); spec. (a) a style of diving in which a mask and…

A dive undertaken without a deep-sea diving suit. See skin-diving, n. Also figurative.

(originally) skin-diving; (in later use more usually) a dive without the use of breathing apparatus, esp. as a competitive sport.

an underwater dive made by a person wearing goggles; hence as v. intransitive; also goggle-diver, goggle-diving.

British. The sport or activity of swimming underwater with breathing apparatus; scuba diving.

Self-contained apparatus designed to enable a swimmer to breathe while under the water. Also (rarely) collective and elliptical for scuba-diving n.…