English

Definition of sour verb from the Oxford Advanced Learner's Dictionary

     

    sour

     verb
    verb
    BrE BrE//ˈsaʊə(r)//
     
    ; NAmE NAmE//ˈsaʊər//
     
    Verb Forms present simple I / you / we / they sour
    BrE BrE//ˈsaʊə(r)//
     
    ; NAmE NAmE//ˈsaʊər//
     
    he / she / it sours
    BrE BrE//ˈsaʊəz//
     
    ; NAmE NAmE//ˈsaʊərz//
     
    past simple soured
    BrE BrE//ˈsaʊəd//
     
    ; NAmE NAmE//ˈsaʊərd//
     
    past participle soured
    BrE BrE//ˈsaʊəd//
     
    ; NAmE NAmE//ˈsaʊərd//
     
    -ing form souring
    BrE BrE//ˈsaʊərɪŋ//
     
    ; NAmE NAmE//ˈsaʊərɪŋ//
     
     
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  1. 1[intransitive, transitive] (of relationships, attitudes, people, etc.) to change so that they become less pleasant or friendly than before; to make something do this The atmosphere at the house soured. sour something The disagreement over trade tariffs has soured relations between the two countries.
  2. 2[intransitive, transitive] sour (something) if milk sours or if something sours it, it becomes sour and has an unpleasant taste or smell
  3. Word Origin Old English sūr, of Germanic origin; related to Dutch zuur and German sauer.Extra examples During rehearsals his tantrums soured the atmosphere. The atmosphere in the house had soured. The disagreement over trade tariffs soured relations between the two countries. The joy over the win was soured by an injury to the captain. They were middle-aged men soured by failure.
See the Oxford Advanced American Dictionary entry: sour