aqualung /ˈakwəlʌŋ / ‹US trademark› Aqua-Lung

a

I. noun

a portable breathing apparatus for divers, consisting of cylinders of compressed air strapped on the diver’s back, feeding air automatically through a mask or mouthpiece.
II. verb [no obj.]

1.
‹dated› swim under water using an aqualung

you oughtn’t to aqualung by yourself.
– origin 1950s (originally a proprietary name in the US): from Latin aqua ‘water’ + lung.

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