Glass jaw

noun

Definitions

Noun
  1. 1
    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?""

  2. 2
    A vulnerability of that sort; a weak spot. figuratively

    "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."

Etymology

An allusion to glass being easily breakable.

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