[souuhr, sou-er]
adjective, sourer, sourest.
having an acid taste, resembling that of vinegar, lemon juice, etc.; tart.
rendered acid or affected by fermentation; fermented.
producing the one of the four basic taste sensations that is not bitter, salt, or sweet.
characteristic of something fermented: a sour smell.
distasteful or disagreeable; unpleasant.
below standard; poor.
harsh in spirit or temper; austere; morose; peevish.
Agriculture. (of soil) having excessive acidity.
(of gasoline or the like) contaminated by sulfur compounds.
Music. off-pitch; badly produced: a sour note.
something that is sour.
any of various cocktails consisting typically of whiskey or gin with lemon or lime juice and sugar and sometimes soda water, often garnished with a slice of orange, a maraschino cherry, or both.
an acid or an acidic substance used in laundering and bleaching to neutralize alkalis and to decompose residual soap or bleach.
verb (used without object)
to become sour, rancid, mildewed, etc.; spoil: Milk sours quickly in warm weather. The laundry soured before it was ironed.
to become unpleasant or strained; worsen; deteriorate: Relations between the two countries have soured.
to become bitter, disillusioned, or disinterested: I guess I soured when I learned he was married. My loyalty soured after his last book.
Agriculture. (of soil) to develop excessive acidity.
verb (used with object)
to make sour; cause sourness in: What do they use to sour the mash?
to cause spoilage in; rot: Defective cartons soured the apples.
to make bitter, disillusioned, or disagreeable: One misadventure needn't have soured him. That swindle soured a great many potential investors.

before 1000; (adj. and noun) Middle English sure, soure, Old English sūr (orig. adj.); cognate with German sauer, Dutch zuur, Old Norse sūrr; (v.) Middle English souren, derivative of the adj.

sourish, adjective
sourly, adverb
sourness, noun
oversour, adjective
oversourly, adverb
oversourness, noun
unsour, adjective
unsourly, adverb
unsourness, noun

5. bitter. 7. severe, testy, touchy, acrimonious, cross, petulant, crabbed.

1. sweet. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sour (ˈsaʊə)
1.  Compare bitter having or denoting a sharp biting taste like that of lemon juice or vinegar
2.  made acid or bad, as in the case of milk or alcohol, by the action of microorganisms
3.  having a rancid or unwholesome smell
4.  (of a person's temperament) sullen, morose, or disagreeable
5.  (esp of the weather or climate) harsh and unpleasant
6.  disagreeable; distasteful: a sour experience
7.  (of land, etc) lacking in fertility, esp due to excessive acidity
8.  (of oil, gas, or petrol) containing a relatively large amount of sulphur compounds
9.  go sour, turn sour to become unfavourable or inharmonious: his marriage went sour
10.  something sour
11.  chiefly (US) any of several iced drinks usually made with spirits, lemon juice, and ice: a whiskey sour
12.  an acid used in laundering and bleaching clothes or in curing animal skins
13.  to make or become sour
[Old English sūr; related to Old Norse sūrr, Lithuanian suras salty, Old Slavonic syrŭ wet, raw, surovu green, raw, Sanskrit surā brandy]

Sour (sʊə)
a variant spelling of Sur

Sur or Sour (sʊə)
transliteration of the Arabic name for Tyre
Sour or Sour

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

O.E. sur, from P.Gmc. *suraz (cf. O.N. surr, M.Du. suur, Du. zuur, O.H.G. sur, Ger. Sauer), from PIE base *suro- "sour, salty, bitter" (cf. O.C.S. syru, Rus. syroi "moist, raw;" Lith. suras "salty," suris "cheese"). Fr. sur "sour, tart" (12c.) is a Gmc. loan-word. The verb is attested from c.1300. Sense
in whisky sour is from 1885. Sourpuss first attested 1937. Sourball is from 1900 as "constantly grumbling person," 1933 as a type of candy. Sour cream is attested from 1855.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
For as tasty as that sweet-and-sour pork may be, eating meat is an incredibly
  inefficient way to feed oneself.
Producing barrel-aged sour beer is a long, expensive gamble.
But the current insularity was in place before the economy went sour.
Mix sour cream with flour and stir in with the sauce.
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