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English definition of “sour”

sour

verb [I or T]     /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 bad debts they leave behind keep mounting.a market/economy sours Companies and families spend less on travel when the economy sours.
(Definition of sour verb from the Cambridge Business English Dictionary © Cambridge University Press)
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