The word of the day (happy result of a dictionary detour) is:
1. the willful distortion or depreciation of the original meaning of a word.
2. a person who willfully distorts the meaning of a word.
Note the deliberation: verbicide is a sin of commission. This isn't malapropism, mistaken identity, well-meaning thought getting out ahead of vocabulary. Destructive of language, destructive of meaning, verbicide might be a form of lying. A cause of loss, occasion for mourning, for fury.