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
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 ?
AYOUR son needs to get to grips with his finances from day one of his working life, otherwise your arrangement for him to live at home could go sour.
Despite its modest size, with a $700,000 annual budget and a staff of five, the Wisconsin Project has managed to make some very big business deals involving high-tech weapons go sour. One of Milhollin's first victories was his successful crusade to shut down heavy-water exports from Norway's nuclear industry to Israel, which still officially denies it wanted the material to build a nuclear bomb.
In a similar slip, he quotes approvingly a weird paragraph from anthropologist Marvin Harris regarding witch hunts in olden times, which embodies reflexive anti-clericism more than rationality: "Did your roof leak, your cow abort, your oats wither, your wine go sour, your head ache, your baby die?