A rhetorical figure with two syntactically parallel constructions, one of which has the word order reversed. For example Alexander Pope's “They fall successive, and successive rise.”
Citation:
Editors. "Chiasmus".
The Literary Encyclopedia. First published 01 November 2001
[http://www.litencyc.com/php/stopics.php?rec=true&UID=183, accessed 21 May 2013.]