Use "dull blade" in a sentence

1. You don't want to be slowed down by an old, dull blade, so shop with us for all your replacement Blades and quickly get back to maintaining your lawn.

2. Imagine someone who hates you with the utmost intensity grabbing a handful of your hair while you're lying prostrate and helpless and scraping a dull blade of a rusty knife around your scalp with a saw-like motion.