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I believe he means zeroing coefficients (as we've been calling it).
It makes sense. Edges are typically not very "average" with respect to its surroundings. Thus it is not well covered by the DC coefficient and other lower freq components and generally requires a number of the higher freq components to represent it correctly. When some of these components get zeroed, the edge gets eroded (less sharp, less defined and unsettles the surrounding area) resulting in the mosquito noise we all hate.
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