sour

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Related to go sour: turned sour, sourer

sour

1. made acid or bad, as in the case of milk or alcohol, by the action of microorganisms
2. (esp of the weather or climate) harsh and unpleasant
3. (of oil, gas, or petrol) containing a relatively large amount of sulphur compounds
4. Chiefly US any of several iced drinks usually made with spirits, lemon juice, and ice

sour

[sau̇r]
(chemistry)
Containing large amounts of malodorous sulfur compounds (such as mercaptans or hydrogen sulfide), as in crude oils, naphthas, or gasoline.
References in periodicals archive ?
When things go sour, he lapses into gloom and guilt, ``rudderless, bitter, sad.
The pupils at Rosedell Elementary School are collecting pennies to pay for a covered shelter, so their peanut butter-and-jelly sandwiches won't melt, their milk won't go sour and they won't perspire as they eat their lunches.
If some things go sour as a result of progress, it only means that our tools have to be sharpened, readjusted.