Late Middle English; earliest use found in John Wyclif (d. 1384), theologian, philosopher, and religious reformer. Originally from reverse + -ing + -ly. In later use re-formed from reversing + -ly.
Definition of reversingly in US English:
reversingly
adverbrɪˈvəːsɪŋli
rare
In a contrary or opposed manner; reversely.
Origin
Late Middle English; earliest use found in John Wyclif (d. 1384), theologian, philosopher, and religious reformer. Originally from reverse + -ing + -ly. In later use re-formed from reversing + -ly.