have a glass jaw

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have a glass jaw

slang (of a boxer) To be apt to be knocked unconscious by one's opponent. Don't worry about that guy, he has a glass jaw—you'll have no trouble knocking him out.
See also: glass, have, jaw
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

have a glass jaw

Fig. to be susceptible to a knockout when struck on the head. (Said only of boxers who are frequently knocked down by a blow to the head.) When the prizefighter was knocked out cold by a right to the chin in the first round, the newspapers said he had a glass jaw. Once a fighter has a glass jaw, he's finished as a boxer.
See also: glass, have, jaw
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
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