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Seward's Icebox was a nickname given to Alaska after Secretary of State William Henry Seward bought it from Russia. The purchase was also nicknamed "Seward's Folly".
The Smithsonian
An icebox is not a food.
An icebox is the old name for refrigerator.
Not me.....
"You have eaten the plums that were in the icebox." is a complete sentence. The sentence is stating a concrete act. There are two concrete nouns in the sentence: plums and icebox.
One can get a good icebox from any Walmart store. They have a number of good icebox items for sale from $30 to over $100. One can also purchase them from Target.
Ice can melt in the icebox because the temperature is not cold enough. The icebox may have a leak through a door. The ice can be too close to the drafty air.
Omarion
It appears to be concrete, unless there weren't any plums in the icebox.
icebox
It was invented in Antarctica