1.   Bent grass with ragged edges indicates a dull blade.

2.   A dull blade can usually be sharpened and reused.

3.   A dull blade will result in ragged cuts and bruised grass with brown tips.

4.   A dull blade will tear and rip at the grass rather that slice right through it, Novotny said.

5.   Dull blades can require considerable pressure to do the trick.

6.   Novotny said that a sharp cut will not add stress to the grass, whereas a dull blade will tear and rip at the grass.

7.   Peelers of this kind have served me very well, but the new Ekco was awkward to use, with a dull blade.

8.   The film will quickly dull even the sharpest blade, and dull blades will tear, not cut the film.

9.   Then scrape, carefully, with a dull blade.

10.   Then there are women who are reluctant to get out of the shower for a replacement blade when they find they have a dull blade in their razor.