Philosophy of language and meta-ethics

Meta-ethical discussions commonly distinguish `subjectivism' from `emotivism; or `expressivism'. But Frank Jackson and Philip Pettit have argued that plausible assumptions in the philosophy of language entail that expressivism collapses into subjectivism. Though there have been responses to their argument, I think the responses have not adequately diagnosed the real weakness in it. I suggest my own diagnosis, and defend expressivism as a viable theory distinct from subjectivism.