air passage provided by a retractable device containing intake and exhaust pipes; permits a submarine to stay submerged for extended periods of time
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
the quality of being widely admired or accepted or sought after; "his charm soon won him affection and popularity"; "the universal popularity of American movies"
something that bulges out or is protuberant or projects from its surroundings; "the gun in his pocket made an obvious bulge"; "the hump of a camel"; "he stood on the rocky prominence"; "the occipital protuberance was well developed"; "the bony excrescence between its horns"
cause to bulge or swell outwards
swell or protrude outwards; "His stomach bulged after the huge meal"
bulge out; form a bulge outward, or be so full as to appear to bulge