Full Idea
Derrida's view is that every discourse is metaphorical, and there is no difference between truth-talk and metaphor.
Gist of Idea
Derrida says that all truth-talk is merely metaphor
Source
report of Jacques Derrida (works [1990]) by Pascal Engel - Truth §2.5
Book Reference
Engel,Pascal: 'Truth' [Acumen 2002], p.59
A Reaction
Right. Note that this is a Frenchman's summary. How would one define metaphor, without mentioning that it is parasitic on truth? Certainly some language tries to be metaphor, and other language tries not to be.