glass jaw

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glass jaw

Where it comes from

An allusion to glass being easily breakable.

noun glass jaws

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). "How was I to know that big ape had a glass jaw?"
Similar: glass chin, bad chin
figuratively A vulnerability of that sort; a weak spot. It is essential that a player be able to identify his glass jaw or his weak spot and learn to deal with it in actual competition.
Similar: Achilles heel, chink in the armor, glass jaw, kryptonite, soft spot, soft underbelly, vulnerability, weakness, weak spot

Opposite: chin

Thesaurus

noun

Opposite: chin

Translations

Every language

noun sensitive chin or jaw

Deutsch	Glaskinn

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MLA

"glass jaw." Wiktionary, via Micwyn, micwyn.com/word/glass%20jaw. Accessed 6 Nov. 2026.

APA

glass jaw. (n.d.). In Wiktionary, via Micwyn. Retrieved November 6, 2026, from https://micwyn.com/word/glass%20jaw

Chicago

"glass jaw." Wiktionary, via Micwyn. Accessed November 6, 2026. https://micwyn.com/word/glass%20jaw.

BibTeX

@misc{glass_jaw_2026,
  title = {glass jaw},
  howpublished = {Wiktionary, via Micwyn},
  year = {2026},
  url = {https://micwyn.com/word/glass%20jaw},
  urldate = {2026-11-06}
}