Coffin.
A raised crust, like the lid of a basket. Hence Shakespeare speaks of a “custard coffin” (Taming of the Shrew, iv. 3). (Greek, kophʹinos, a basket.) (See Mahomet’s Coffin.)
“Of the paste a coffin will I rear.”
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Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.