Definition of glass jaw in English:

glass jaw

noun

Boxing
informal
  • A weak jaw that is easily broken, especially as an indication of a fighter's vulnerability to an opponent's punches.

    • ‘Finally the job falls to Peppe, a boxer with a glass jaw, who needs to find a way to make some cash outside of his unsuccessful career in the ring.’
    • ‘I would have been the kid who looked up at him and said, ‘Jeez, did that guy have a glass jaw or what?’’
    • ‘He is small for a modern heavyweight, has no punch and a glass jaw.’
    • ‘But they can't escape their support for privatizing Social Security, which looks increasingly like the biggest glass jaw in recent electoral history.’
    • ‘‘Your partner has a glass jaw,’ Kurtz remarked, looking past Ford and tilting his head in Jake's direction.’
    • ‘He yells at me after his fist is removed from my glass jaw.’