Other forms: chiasmuses
Chiasmus is a rhetorical technique that involves a reversal of terms, such as “It’s good to be lucky, but it’s lucky to be good.”
Chiasmus is a literary device using repetition to create compelling statements, including many famous quotations, such as John F. Kennedy’s famous call to action: “Ask not what your country can do for you; ask what you can do for your country." The roots of this word come from the Greek letter chi, which is roughly a cross shape, and chiasmus does involve a crossing over of terms, as in the saying, “When the going gets tough, the tough get going.“