# birdsmouth

> English word · Noun · IPA /ˈbɜːdsmaʊθ/

## Definitions
1. A notch cut into the underside of a rafter to ensure that it does not move when resting on the wall plate running across the top of a wall; a similar notch in other timber components.

## Etymology
From bird + -s- + mouth, from its appearance.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/birdsmouth