# glass jaw

> English word · Noun

## Definitions
1. A fighting vulnerability where one is easily knocked out via a single hard blow to the chin or jaw (due to lack of conditioning, insufficient training, or damage from past cerebral concussions).
2. A vulnerability of that sort; a weak spot.

## Etymology
An allusion to glass being easily breakable.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-09-03.
Canonical page: https://plainspell.com/en/word/glass-jaw