repudiation, renunciation -- (rejecting or disowning or disclaiming as invalid; "Congressional repudiation of the treaty that the President had negotiated")
repudiation -- (refusal to acknowledge or pay a debt or honor a contract (especially by public authorities); "the repudiation of the debt by the city")
repudiation, debunking -- (the exposure of falseness or pretensions; "the debunking of religion has been too successful")