vinegar UK /ˈvɪnəɡəː/US /ˈvɪnəɡɚ/noun 3verb 1forms 3phrases 1 noun3 •A sour liquid formed by the fermentation of alcohol used as a condiment or preservative; a dilute solution of acetic acid. •Any variety of vinegar.a range of herb-flavoured vinegars •(US, informal) Vigor; vitality.[Rahm Emanuel] was full of vinegar on his proposal of mandatory retirement at age 75 for the president and the rest of the executive branch, as well as Congress and the judiciary. — 2026 verb1 •To season or otherwise treat with vinegar.Accordingly, after a vast amount of moaning and crying up-stairs, and much damping of foreheads, and vinegaring of temples, and hartshorning of noses, and so forth […] — 1841 formsvinegared · vinegaring · vinegars Phrases with vinegar full of piss and vinegarExuberant or enthusiastic, especially to an excessive degree; brazen.