sour
verb [ I or T ]
uk/saʊər/ usto 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.
sour
adjective
uk/saʊər/ usno 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.