Make Sour, Not Alkaline
This page is the CodyCross answer for the clue below from Larger than Life, Group 2145, Puzzle 5 (Channel Tunnel).
Question is: Make Sour, Not Alkaline
and the answer is: ACIDIFY
Word Meaning:
ACIDIFY — To make something (more) acidic or sour; to convert into an acid.
Definitions from Wiktionary.