Roughly a half-century ago, R.M. Hare gave us a potent argument against attempts to account for the meaning of moral language in non-normative or ‘descriptive’ terms. The argument relies on the idea that in order to have genuine moral disagreement, we have to be talking about the same thing. Real disagreement requires agreement in meaning: if the words we use in our disputes mean different things, then we're just talking past, and not to, one another. Using this simple observation, Hare argues that if the meaning of an evaluative word such as ‘good’ were primarily descriptive, then groups with sufficiently different standards for applying ‘good’ wouldn't be able to enter into a real evaluative disagreement. But these disagreements are possible. Hence, he concluded, it's the evaluative meaning of ‘good’ that's primary — and any descriptive account is bound to fail because it doesn't capture the crucial element of endorsement that's central to normative language.