Full Idea
Deflationism says the theory of truth does not have a substantial domain of its own. The domain of the theory of truth consists of the bearers of truth.
Gist of Idea
Deflationism says truth isn't a topic on its own - it just concerns what is true
Source
Leon Horsten (The Tarskian Turn [2011], 05.1)
Book Reference
Horsten,Leon: 'The Tarskian Turn' [MIT 2011], p.60
A Reaction
The immediate thought is that truth also concerns falsehoods, which would be inexplicable without it. If physics just concerns the physical, does that mean that physics lacks its own 'domain'? Generalising about the truths is a topic.