In order to make bad or acid in a moderate level to sour significantly
- make sour or more bad
- to create sour or acidic in a moderate degree; to bad somewhat.
to provide a dish or liquid a somewhat acid, tart or piquant style with the addition of some lemon liquid, vinegar, or unripened fruit juice.
(v. t.) To produce sour or acid in a moderate level; to sour significantly.