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
very close; "without my reading glasses I can hardly see things close up"; "even firing at close range he missed"
refuse to talk or stop talking; fall silent; "The children shut up when their father approached"
unite or bring into contact or bring together the edges of; "close the circuit"; "close a wound"; "close a book"; "close up an umbrella"
cease to operate or cause to cease operating; "The owners decided to move and to close the factory"; "My business closes every night at 8 P.M."; "close up the shop"