Full Idea
There is only one way anyone knows how to define 'true' and that is Tarski's way.
Gist of Idea
Only Tarski has found a way to define 'true'
Source
Hilary Putnam (Meaning and the Moral Sciences [1978], Lec II.5)
Book Reference
Putnam,Hilary: 'Meaning and the Moral Sciences' [RKP 1981], p.30
A Reaction
However, Davidson wrote a paper called 'On the Folly of Trying to Define Truth', which seems to reject even Tarski. Also bear in mind Putnam's earlier remark (Idea 6265) that there is more to truth than Tarski's definition. Just take 'true' as primitive.
Related Idea
Idea 6265 Tarski has given a correct account of the formal logic of 'true', but there is more to the concept [Putnam]