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false bottom

   Also found in: Dictionary/thesaurus, Wikipedia 0.01 sec.
false bottom [¦fȯls ′bäd·əm]
(civil engineering)
A temporary bottom installed in a caisson to add to its buoyancy.
(metallurgy)
An insert put in either member of a die set to increase the strength and improve the life of the die.
(mining engineering)
A flat, hexagonal or cylindrical iron die upon which ore is crushed in a stamp mill.


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Taking it between my finger and thumb, and drawing it upward, I discovered that there was a false bottom to the case, forming a secret compartment for letters and papers.
"Yes," he declared, after looking it over, "the thing certainly has a false bottom.
 
 
 
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