Full Idea
An old objection to conventionalism claims that it confuses sentences with propositions, confusing what makes sentences mean what they do with what makes them (as propositions) true.
Gist of Idea
Maybe conventionalism applies to meaning, but not to the truth of propositions expressed
Source
Bob Hale (Necessary Beings [2013], 05.2)
Book Reference
Hale,Bob: 'Necessary Beings' [OUP 2013], p.120
A Reaction
The conventions would presumably apply to the sentences, but not to the propositions. Since I think that focusing on propositions solves a lot of misunderstandings in modern philosophy, I like the sound of this.