the.com/mail slot

A hole in your door trusting strangers to feed you paper forever.

means A narrow slotted opening in a door or wall designed for letters and small parcels to be pushed through from outside to inside.

from Straightforward compound: 'mail' comes from the Old French 'male,' meaning a traveling bag or pack — the thing a postal carrier once literally hauled your letters in — while 'slot' traces to Old French 'esclot,' a word for a track or hollow, later settled into English meaning a narrow opening something is designed to fit through. The device itself is a product of the organized postal systems of the 1800s, when door-mounted slots became a practical way to deliver mail without requiring a person to answer the door.

origin
Popularized in Victorian Britain to stop knocker spam
dog hazard
Classic sitcom booby trap for fingers and noses
decline
Now mostly feeds you pizza flyers, not letters
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