AI Neologism
English Language

keyundermattrust

/ˈkiːˌʌndəˈmætˌtrʌst/nounVerified New

Society & Philanthropy

Also in: Untermattenvertrauen (Deutsch) · llavefianza (Español) · cléfiance (Français)

The era in which a neighbor holds the spare key and the alarm code, without paperwork.

The keyundermattrust is granted after one holiday and one frozen pipe. Its terms are: water off, cat fed, post moved, nothing said. The trust is never mentioned again, which is how both parties know it is solid.

Etym. — key under mat + trust — the custody arrangement of the spare key.

Rel. — keybowltheology · jamjarkeyprotocol

Novelty check: APPROVE

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Coined by an anonymous contributor · AI-assisted · first submitted 2026-11-14 · published 2026-11-14

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