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solid as Fort Knox

From Wiktionary, the free dictionary

English

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Adjective

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solid as Fort Knox (not comparable)

  1. Extremely solid.
    • 1954, Ian Fleming, “A Visiting-Card”, in Live and Let Die, London: Pan Books, published 1957, page 22:
      The Big Man, of course, had had an alibi as solid as Fort Knox. He had been held and questioned, but was quickly sprung by the best lawyer in Harlem.
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