D defs.my
Entry 2 senses Webster, 1913

Acidify

/əs-ĭd'-əf-īˌ/ · A·cid·i·fy · IPA /əˈsɪdɪfaɪ/
01 v. t. To make acid; to convert into an acid; as, to acidify sugar.
imp. & p. p. Acidified; p. pr. & vb. n. Acidifying
  1. 1.
    To make acid; to convert into an acid; as, to acidify sugar.
  2. 2.
    To sour; to imbitter.
    “His thin existence all acidified into rage.” Carlyle.