from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun Sports Vulnerability of a boxer to a knockout punch.
- noun Vulnerability, especially of a public figure, to destructive criticism.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun A
sensitive chinor jaw, the physical striking of which tends to result in a knockout.
from Wiktionary, Creative Commons Attribution/Share-Alike License
An allusion to the fact that glass is easily breakable.
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