When words and phrases change their meaning, we might find ourselves less able to understand and communicate, and this can be harmful to us. I make sense of this by introducing the concept of hermeneutical disarmament. Hermeneutical disarmament is the process by which a person is rendered less able to understand or communicate experiences, ideas, and other phenomena as a result of semantic change to the linguistic resources that could previously have been deployed for these purposes. I defend this concept (...) by showing that semantic change can inflict cognitive and communicative harms and detail some of the forms that it can take. (shrink)