Full Idea
Assertive content - what a sentence is heard as saying - can be at quite a distance from compositional content.
Gist of Idea
The content of an assertion can be quite different from compositional content
Source
Stephen Yablo (Aboutness [2014], Intro)
Book Reference
Yablo,Stephen: 'Aboutness' [Princeton 2014], p.5
A Reaction
This is the obvious reason why semantics cannot be entirely compositional, since there is nearly always a contextual component which then has to be added. In the case of irony, the compositional content is entirely reversed.