Full Idea
If the evidence for p is q, and that is the only evidence there is or can be, then 'p' means q. Hence there is no gap between evidence and conclusion, and the sceptical problem does not arise.
Clarification
Logical positivism says meaning is the same as the verification of the proposition
Gist of Idea
Logical positivism avoids scepticism, by closing the gap between evidence and conclusion
Source
Roger Scruton (Modern Philosophy:introduction and survey [1994], 3.2)
Book Reference
Scruton,Roger: 'Modern Philosophy: introduction and survey' [Sinclair-Stevenson 1994], p.25