From Longman Dictionary of Contemporary Englishacidifya‧cid‧i‧fy /əˈsɪdɪfaɪ/ verb (acidified, acidifying, acidifies) [intransitive, transitive] technicalHC to become an acid or make something become an acid→ See Verb table
Examples from the Corpus
acidify• It appears that deciduous trees do not acidify in this way.• Again, acidifying old water is not suitable.• Because cryptocorynes acidify the water, they form a favorable medium for the survival and spawning of many popular fish species.• Bennett and Williams suggest that the cells of opening or closing traps acidify their own walls by releasing hydrogen ions.• Once your water is soft it is easily acidified using peat filtration. 