Acidulate

• (v. t.) To make sour or acid in a moderate degree; to sour somewhat.
Found on http://thinkexist.com/dictionary/meaning/acidulate/

Acidulate

A·cid'u·late transitive verb [ imperfect & past participle Acidulated ; present participle & verbal noun Acidulating ] [ Confer French aciduler . See Acidulous .] To make sour or acid in a moderate degree; to sour somewhat...
Found on http://www.encyclo.co.uk/webster/A/20

acidulate

acidulate 1. To render more acid or sour. 2. To make somewhat acid or sour; to flavor with an acid.
Found on http://www.wordinfo.info/words/index/info/view_unit/2369/3
No exact match found