sour - definition in the American English Dictionary - Cambridge Dictionaries Online

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English definition of “sour”

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sour

adjective  us   /sɑʊər/

sour adjective (TASTE)

(esp. of food) having a sharp taste: The four basic tastes are sweet, salty, bitter, and sour.

sour adjective (UNPLEASANT)

unfriendly or unpleasant in manner or attitude: The team’s perfect season went/turned sour after they lost their second straight game.

sour

verb  us   /sɑʊər/

sour verb (TASTE)

[I] to become sour: I’m afraid the milk has soured.

sour verb (UNPLEASANT)

[I/T] to become bad or unpleasant, or cause someone to feel bad or unhappy: [I] When the economy soured, donations to the charity dried up.
(Definition of sour from the Cambridge Academic Content Dictionary © Cambridge University Press)
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