|Definition - A figure of speech where a word or a phrase in one clause or phrase is repeated in the opposite order in the next clause or phrase.|
Example - When the tough get going, the going gets tough.
Etymology - The word derives from the Greek anti, in opposite direction, and metabole, turning about.
Oxford English Dictionary - Its first citation is from 1589:
"Antimetauole or the Counterchange … as thus.
If Poesie be, as some haue said,
A speaking picture to the eye:
Then is a picture not denaid,
To be a muet Poesie."
(Puttenham Eng. Poesie 217)