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.

Common Names:

Name	Pronounced	Usage
Pompilius	-	Ancient Roman
Neven	-	Croatian, Serbian, Macedonian
Howe	[hau]
Nikostratos	-	Ancient Greek
Jacob	['dʒeikəb]
Alfwin	-	Ancient Germanic