Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • transitive v. To make or become acid.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • v. to make something (more) acidic or sour; to convert into an acid.
  • v. to neutralize alkalis, as to acidify sugar
  • v. to sour, to embitter.

from the GNU version of the Collaborative International Dictionary of English

  • transitive v. To make acid; to convert into an acid.
  • transitive v. To sour; to imbitter.

from The Century Dictionary and Cyclopedia

  • To make acid; convert into an acid; render sour; sour, literally or figuratively.
  • To become acid or sour.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • v. turn acidic
  • v. make sour or more sour

Etymologies

From acid +‎ -fy, from Latin acidus ("sour, acid"); compare French acidifier. (Wiktionary)

Examples

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