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English definition of “sour”

sour

adjective 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.

sour adjective (BAD FEELING)

unfriendly or easily annoyed: Overnight, it seemed, their relationship had turned sour. She gave me a sour look.
sourly
adverb uk   /ˈsaʊə.li/ us    /ˈsaʊr-/
sourness
noun [U] uk   /ˈsaʊə.nəs/ us    /ˈsaʊr-/

sour

verb [I or T] uk   /saʊər/ us    /saʊr/

sour verb [I or T] (TASTE)

to become sour or to make something become sour: Hot weather sours milk. Milk sours in hot weather.

sour verb [I or T] (BAD FEELING)

to (cause to) become unpleasant or unfriendly: Her whole attitude to life soured as a result of that experience. This affair has soured relations between the two countries.

sour

noun [C] uk   /saʊər/ us    /saʊr/ mainly US
a drink made from strong alcohol, lemon, or lime juice, sugar, and ice: a whisky sour
(Definition of sour from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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