They were just emerging from a narrow court not far from the open square in Clerkenwell, which is yet called, by some strange perversion of terms, ’The Green’: when the Dodger made a sudden stop; and, laying his finger on his lip, drew his companions back again, with the greatest caution and circumspection.
There are no more uses of "perversion" in the book.
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It was an unacceptable perversion of justice.
The library wants to assure the Internet is not used to strengthen pedophilia or other unhealthy sexual perversions.