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sour [ˈsawɚ]

1 sour adjective
  • having an acid taste that is like the taste of a lemon : tart
  • having the unpleasant taste or smell of food that is no longer fresh
  • unpleasant or unfriendly

2 sour noun
  • an alcoholic drink that has a sour taste

3 sour verb
  • to lose freshness and get an unpleasant taste or smell : to become sour
  • to become unpleasant or unfriendly
  • to make (someone or something) unpleasant or unfriendly