sour

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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
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

sour

[sau̇r]
(chemistry)
Containing large amounts of malodorous sulfur compounds (such as mercaptans or hydrogen sulfide), as in crude oils, naphthas, or gasoline.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
"Painless" follows tycoon Augustus Valentine as his latest shady venture goes sour. The smuggling operation goes wrong as a his cargo is heisted, and very powerful people are displeased with him.
Her boyfriend is nearly shot when a drug buy goes sour, but that doesn't stop Allison returning.