English to English

verb (v)

• make sour or more sour(verb.perception)

  Synonym:
  acidify, acidulate, sour
  Antonym:
  dulcify, dulcorate, edulcorate, sweeten
  

  source: wordnet30
• turn acidic(verb.change)

  Synonym:
  acidify
  Antonym:
  alkalify, alkalise, alkalize, basify
  

  source: wordnet30
• To convert into acid or vinegar.(verb)

  source: webster1913
• To turn acid.(verb)

  source: webster1913