| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |
| red herring | |
| —n | |
| 1. | anything that diverts attention from a topic or line of inquiry |
| 2. | a herring cured by salting and smoking |
In argument, something designed to divert an opponent's attention from the central issue. If a herring is dragged across a trail that hounds are following, it throws them off the scent.
red herring
Something that draws attention away from the central issue, as in Talking about the new plant is a red herring to keep us from learning about downsizing plans. The herring in this expression is red and strong-smelling from being preserved by smoking. The idiom alludes to dragging a smoked herring across a trail to cover up the scent and throw off tracking dogs. [Late 1800s]