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 act of protesting; a public (often organized) manifestation of dissent
a formal and solemn declaration of objection; "they finished the game under protest to the league president"; "the senator rose to register his protest"; "the many protestations did not stay the execution"
the act of making a strong public expression of disagreement and disapproval; "he shouted his protests at the umpire"; "a shower of protest was heard from the rear of the hall"
utter words of protest
affirm or avow formally or solemnly; "The suspect protested his innocence"
express opposition through action or words; "dissent to the laws of the country"