scuba

scuba — noun

1. the activity of swimming underwater while breathing air from a tank strapped on

1.nounB1
Definition

the activity of swimming underwater while breathing air from a tank strapped on your back, done for enjoyment, exercise, or exploration

Example

Élise took up scuba lessons after moving to the coast of Thailand.

collocation: 'take up scuba' for starting the activity

Christopher and his sister went scuba diving in the clear waters near Bali.

modifier use: 'scuba diving' as a compound noun

Common collocations
  • take up scuba
  • go scuba diving
  • scuba diving
  • scuba lesson
  • scuba trip
  • scuba instructor
Synonyms
  • scuba diving

    the full name of the sport; more common in everyday speech

  • diving

    broader term that can include freediving or professional diving; context disambiguates

Grammar Patterns

scuba + noun (diving, lesson, trip, instructor)

go scuba diving

Usage Note

Often used as a modifier before nouns such as 'diving', 'lesson', or 'trip'. The full phrase 'scuba diving' is more common than 'scuba' alone when naming the activity.

Common Mistakes

I want to try scuba this summer.
I want to try scuba diving this summer.
Adding 'diving' makes the activity clear, since 'scuba' alone can also refer to the equipment.
She learned to scuba in Hawaii.
She learned to scuba dive in Hawaii.
'Scuba' is a noun, not a verb; use 'scuba dive' for the action.

2. the set of equipment worn underwater that lets a diver breathe, made up of one o

2.nounB2
Definition

the set of equipment worn underwater that lets a diver breathe, made up of one or more tanks of compressed air, a regulator, and a mouthpiece connected by tubes

Example

Bao checked his scuba equipment carefully before jumping into the ocean off the coast of Hualien.

equipment sense: 'scuba equipment' with pre-dive safety check

Gabriel forgot to rinse his scuba gear with fresh water after the afternoon dive off the pier.

post-dive maintenance: 'rinse scuba gear with fresh water'

Common collocations
  • scuba gear
  • scuba equipment
  • scuba tank
  • rinse one's scuba
  • check one's scuba
Synonyms
  • scuba gear

    more common in everyday speech; refers to the whole set of equipment

  • diving equipment

    broader term that includes masks, fins, wetsuits, and other gear beyond the breathing apparatus

  • Aqua-Lung

    historical trademark (Cousteau's invention); still used occasionally, especially in older texts

Grammar Patterns

scuba gear / scuba equipment

a scuba (one set)

Usage Note

Can be used as a countable noun (a scuba = one complete set of equipment) or an uncountable noun (scuba gear / scuba equipment). The word originated as the acronym SCUBA (Self-Contained Underwater Breathing Apparatus).

Common Mistakes

He forgot his scuba diving at home.
He forgot his scuba gear at home.
'Scuba diving' is an activity, not a physical object; use 'scuba gear' or 'scuba' for the equipment.

Word family

  • scuba dive
    verbB2
  • scuba diver
    nounB2
  • scuba diving
    nounB1

Synonym discussion

Sense: noun/1

All three words describe water activities, but they differ in equipment and technique. Scuba diving (or simply 'scuba') uses a tank of compressed air strapped to the diver's back, allowing the person to stay underwater for extended periods. Snorkeling involves floating on the surface with a mask and a breathing tube (snorkel) and requires no special training. Freediving (also called breath-hold diving) means swimming underwater on a single breath, without any breathing apparatus. Scuba diving demands certification and is the most equipment-intensive of the three, while snorkeling is the most casual. For example: 'Élise got her scuba certification in Ko Tao' versus 'We spent the afternoon snorkeling just off the beach.'

scuba divingsnorkeling ↗freediving

Common collocations

Nouns

  • scuba diving
  • scuba gear
  • scuba equipment
  • scuba tank
  • scuba instructor
  • scuba lesson
  • scuba trip
  • scuba certification

Phrases

  • go scuba diving
  • take up scuba
  • scuba diving certification

Prepositions

  • scuba for beginners
  • scuba in [location]

Etymology

English

Scuba originated as an acronym for Self-Contained Underwater Breathing Apparatus, coined in the 1940s during the development of the first modern diving equipment. The term was originally trademarked but quickly became a generic word for any underwater breathing device. The lowercase spelling 'scuba' reflects its transition from an acronym to an ordinary English noun.