the.com/dulling
The slow death of shine, sharpness, or sparkle into a flat shrug.
means The act or process of making something less sharp, bright, intense, or interesting.
from From Old English dol, meaning foolish or stupid, which sharpened into senses of blunt and lifeless before becoming this gradual flattening.
Blade tradeKnives lose edge from microscopic metal bending, not vanishing.
Pain hackAnesthetics work by dulling nerve signals to the brain.
Color theoryAdding gray or a complement dulls any vivid hue.