What is the meaning of the word "sour"?

Definitions:

  1. go sour or spoil copy to clipboard verb
    • The milk has soured copy to clipboard
  2. in an unpalatable state copy to clipboard adjective
    • sour milk copy to clipboard
  3. inaccurate in pitch copy to clipboard adjective
    • a false (or sour) note copy to clipboard

Synonyms:

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