Full Idea
Propositions play the role of dis-ambiguators; they are the things between which utterances are ambiguous.
Gist of Idea
Propositions are what settle problems of ambiguity in sentences
Source
Roy Sorensen (Vagueness and Contradiction [2001], 7.7)
Book Reference
Sorensen,Roy: 'Vagueness and Contradiction' [OUP 2004], p.121
A Reaction
I have become a great fan of propositions, and I think this is one of the key reasons for believing in them. The proposition is what we attempt to pin down when asked 'what exactly did you mean by what you just said?'