Full Idea
We can introduce 'sharpenings', to make vague terms precise without disturbing their semantics. Then truth (or falsity) becomes true(false)-in-all-sharpenings. You are only 'rich' if you are rich-on-all-sharpenings of the word.
Gist of Idea
We can 'sharpen' vague terms, and then define truth as true-on-all-sharpenings
Source
Theodore Sider (Logic for Philosophy [2010], 3.4.5)
Book Reference
Sider,Theodore: 'Logic for Philosophy' [OUP 2010], p.84
A Reaction
Not very helpful. Lots of people might be considered rich in many contexts, but very few people would be considered rich in all contexts. You are still left with some vague middle ground.