sour - definition and synonyms

verb [intransitive/transitive] 

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/ˈsaʊə(r)/
present tense
I/you/we/theysour
he/she/itsours
present participlesouring
past tensesoured
past participlesoured
  1. 2
    if something such as milk sours, or if something sours it, it gets an unpleasant taste or smell because it is no longer fresh