Water slightly acidulated with the acid, so that its sourness to the taste is about that of common vinegar.
Any expression seems to crack it—with the exception of sourness.
As to the men personally, he chose Carpendike, for all his obstinacy and sourness.
It had given her face no sourness, but it put a shadow into her eyes.
But though his temper was puritanic and inclined to moroseness, there was no sourness or cynicism in it.
The only way is to give them drink; this will mellow the sourness of age.
It was true the churn smelled of sour buttermilk, and such a sourness as it was!
It was to him the one smart of sourness in her charm as a woman.
The hay takes off any sourness, and ensures it being perfectly sweet.
With all her prejudices and sourness, she was as good as gold when any of us were ill.
Old English sur "sour, tart, acid, fermented," from Proto-Germanic *sura- "sour" (cf. Old Norse surr, Middle Dutch suur, Dutch zuur, Old High German sur, German Sauer), from PIE root *suro- "sour, salty, bitter" (cf. Old Church Slavonic syru, Russian syroi "moist, raw;" Lithuanian suras "salty," suris "cheese").
French sur "sour, tart" (12c.) is a Germanic loan-word. Meaning :having a peevish disposition" is from early 13c. Sense in whisky sour (1885) is "with lemon added" (1862). Sour cream is attested from 1855.
c.1300, from sour (adj.). Cf. Old High German suren, German säuern. Related: Soured; souring.