vinegar ‘wine turned sour; sharp’
Lexical development traced from the Tamil root:
E. vynagre, vyneygre, vineager < O.F. vinaigre ‘vinegar’ < vin ‘wine’ + M.E eegre, aygre, eiger < O.F. aigre ‘sour, acid; harsh, bitter, rough; eager greedy; lively, active, forceful’ < Vulgar Lat. acrus < Lat. acer ‘keen, sharp, pointed, piercing; acute, ardent, zealous’ < eeg < ak < Tamil akku
Other meanings: sourness of speech or mood; liveliness and enthusiasm.