rubbing out

It sounds like another instance of Colbert rubbing out the line between satire and reality.

The less rubbing out the better the learner will progress, and the more satisfaction he will receive from the results.

Daubing in and rubbing out again, and staring at her till I knew she was beginning to feel uneasy and anxious.

In the rubbing out form of the puzzle, first rub out A to B with a single finger in one stroke.

To the final coat add a little lemon yellow as a guide in rubbing out.

This oil coat requires a clean, smooth rubbing out—as clean and smooth as a coat of paint.