skin diving
US /ˈskɪn ˌdaɪ.vɪŋ/
UK /ˈskɪn ˌdaɪ.vɪŋ/

1.
skin diving, vrijduiken
the sport of swimming underwater with a snorkel and flippers, without the use of breathing apparatus
:
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We went skin diving in the clear waters of the Caribbean.
We gingen skin diving in het heldere water van de Caraïben.
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She enjoys skin diving to observe marine life.
Ze geniet van skin diving om het onderwaterleven te observeren.