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Noun: souring  saw-(u-)ring
  1. The process of becoming sour
Verb: sour  saw(-u)r
  1. Go sour or spoil
    "The milk has soured";
    - turn, ferment, work
  2. Make sour or more sour
    "For example, acidulate fresh cream by adding lemon juice to produce sour cream";
    - acidify, acidulate, acetify

Derived forms: sourings

Type of: change state, change taste, spoilage, spoiling, turn

Encyclopedia: Souring

Sour, Robert