curate's egg

Brit. something that has both good and bad characteristics or parts

Origin: based on a joke in an 1895 issue of the English magazine Punch: when served a stale egg at his bishop's home, a timid curate says that parts of it are excellent

See curate's egg in American Heritage Dictionary 4

cu·rate's egg

noun
Chiefly British
Something with both good and bad qualities.

Origin: From a story in Punch about a curate who, having been served a bad egg by his bishop, said that parts of it were excellent.

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