Borrowing dulls the edge of husbandry. --Shak.
2. To make dull, stupid, or sluggish; to stupefy, as the
senses, the feelings, the perceptions, and the like.
Those [drugs] she has Will stupefy and dull the
sense a while. --Shak.
Use and custom have so dulled our eyes. --Trench.
3. To render dim or obscure; to sully; to tarnish. ``Dulls
the mirror.'' --Bacon.
4. To deprive of liveliness or activity; to render heavy; to
make inert; to depress; to weary; to sadden.
Attention of mind . . . wasted or dulled through
continuance. --Hooker.