The noun Verwesung in ordinary usage means decomposition, and the corresponding verb verwesen means to perish or decay. Heidegger here uses Verwesung in a quite literal sense, to refer to that ongoing event of the deposing of the suprasensory world in which the suprasensory loses its essence. As this event takes place, culminating in Nietzsche's decisive work of the overturning of metaphysics, metaphysics, as the truth of what is as such, becomes the very reverse of itself and enters into its own nonenduring. (QCT p. 65)