"You epitomize it beautifully," said Mr. Caryll, with a reversion to his habitual manner.
A reversion to close imperialism would be for her a retrogression.
I used the word 'atavism' to mean a reversion to the primitive.
They are only playing each other's rôles, because the poles have swung into reversion.
War is neither an overflow of energy nor a reversion to primitive ...