noun
a weak or easily breakable chin, often used in boxing to describe a fighter who is easily knocked out
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The boxer was known for his glass chin, often getting knocked out in the early rounds of his fights.
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I wouldn't want to get into a fight with him, he's got a glass chin.
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That guy has a glass chin, one punch and he's out cold.
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Her argument had a glass chin, easily shattered by a few well-placed points.