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Meaning of “sour” in the English Dictionary

"sour" in British English

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souradjective

uk   /saʊər/  us   /saʊr/
  • sour adjective (TASTE)

B1 having a ​sharp, sometimes ​unpleasant, ​taste or ​smell, like a ​lemon, and not ​sweet: These ​plums are a ​bit sour.

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sourly
adverb uk   /ˈsaʊə.li/  us   /ˈsaʊr.li/
sourness
noun [U] uk   /ˈsaʊə.nəs/  us   /ˈsaʊr.nəs/

sourverb [I or T]

uk   /saʊər/  us   /saʊr/

sournoun [C]

uk   /saʊər/  us   /saʊr/ mainly US
(Definition of sour from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"sour" in American English

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souradjective

 us   /sɑʊər/
  • sour adjective (TASTE)

(esp. of ​food) having a ​sharptaste: The four ​basictastes are ​sweet, ​salty, ​bitter, and sour.
  • sour adjective (UNPLEASANT)

unfriendly or ​unpleasant in ​manner or ​attitude: The team’s ​perfectseason went/​turned sour after they ​losttheir second ​straightgame.

sourverb

 us   /sɑʊər/
  • sour verb (TASTE)

[I] to ​become sour: I’m ​afraid the ​milk has soured.
  • sour verb (UNPLEASANT)

[I/T] to ​becomebad or ​unpleasant, or ​cause someone to ​feelbad or ​unhappy: [I] When the ​economy soured, donations to the ​charitydried up.
(Definition of sour from the Cambridge Academic Content Dictionary © Cambridge University Press)

"sour" in Business English

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sourverb [I or T]

uk   us   /saʊər/
to become, or cause to become, less pleasant, ​friendly, or ​successful: Meeting ​clients unexpectedly can sour a ​relationship. Loans are souring, as ​bankruptcies and the ​baddebts they ​leave behind ​keepmounting.a market/economy sours Companies and families ​spend less on ​travel when the ​economy sours.

souradjective

uk   us   /saʊər/
no ​longersuccessful or pleasant: sour economy/market The ​economicslump was caused primarily by a sour ​housingmarket.
go sour
to ​fail or become unpleasant: Year-end is traditionally when many ​investors decide whether to ​sellstocks that have gone sour.
(Definition of sour from the Cambridge Business English Dictionary © Cambridge University Press)
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“sour” in Business English

There, their and they’re – which one should you use?
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