sour on

: causing or characterized by the one of the four basic taste sensations that is produced chiefly by acids — compare bitter, salt, sweet

: having the acid taste or smell of or as if of fermentation : turned

: of or relating to fermentation

: something sour

: the primary taste sensation produced by acid stimuli

: a cocktail consisting of a liquor (such as whiskey), lemon or lime juice, sugar, and sometimes ice

: to become sour

: to make sour