diving
US /ˈdaɪ.vɪŋ/
UK /ˈdaɪ.vɪŋ/

1.
the sport or activity of swimming underwater with special equipment to breathe
:
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She loves diving in the clear waters of the Caribbean.
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We went diving and saw many colorful fish.
2.
the sport of jumping into water with your head first from a diving board or platform
:
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She won a gold medal in competitive diving.
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The synchronized diving event was impressive.