sour

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Concise Oxford English Dictionary © 2008 Oxford University Press:
sour/ˈsaʊə(r)/
adjective
  • 1 having an acid taste like lemon or vinegar.
  • 2 (of food, especially milk) having gone bad because of fermentation.

    ■ having a rancid smell.

  • 3 showing resentment, disappointment, or anger.
  • 4 (of soil) deficient in lime.
  • 5 (of petroleum or natural gas) containing a high proportion of sulphur.
noun a cocktail made by mixing a spirit with lemon or lime juice. verb make or become sour.
– phrases
go (or turn) sour become less pleasant; turn out badly.
sour grapes an attitude in which someone pretends to despise something because they cannot have it themselves. [with allusion to Aesop's fable The Fox and the Grapes.]
– derivatives
sourish adjective,
sourly adverb,
sourness noun.
– origin OE sūr, of Gmc origin.
'sour' also found in these Oxford entries:

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