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English definition of “sour”

sour

adjective
 
 
/saʊər/
no longer successful or pleasant: sour economy/market The economic slump was caused primarily by a sour housing market.
go sour to fail or become unpleasant: Year-end is traditionally when many investors decide whether to sell stocks that have gone sour.
(Definition of sour adjective from the Cambridge Business English Dictionary © Cambridge University Press)
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