snorkel

Noun
  1. Breathing device consisting of a bent tube fitting into a swimmer's mouth and extending above the surface;
    Allows swimmer to breathe while face down in the water (synset 104258254)
  2. Air passage provided by a retractable device containing intake and exhaust pipes;
    Permits a submarine to stay submerged for extended periods of time (synset 104257960)
Verb
  1. Dive with a snorkel (synset 201967802)

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