bladder UK /ˈblædə/US /ˈblædɚ/noun 7verb 2forms 3phrases 1 noun7 •A flexible sac that can expand and contract and that holds liquids or gases. •Specifically, the urinary bladder. •A hollow, inflatable organ of a plant. •The inflatable bag inside various balls used in sports, such as footballs and rugby balls. •A container in the form of a flexible bag. •A sealed plastic bag that contains wine and is usually packaged in a cask. •(figurative) Anything inflated, empty, or unsound.to swim with bladders of philosophy — 1711 verb2 •To swell out like a bladder with air; to inflate.bladder'd up with pride of his own merit — 1610 •To store or put up in bladders. formsbladdered · bladdering · bladders Phrases with bladder shy bladderAn inability to urinate in the presence of others.