As verbs the difference between usurp and misappropriate
is that usurp
is to seize power from another, usually by illegitimate means while misappropriate
is to use something wrongly, or illegally.
To seize power from another, usually by illegitimate means.
To use and assume the coat of arms of another person.
(obsolete) To make use of.
* 1662 , , Appendix, A Collection of Several Philosophical Writings of Dr. Henry More, p. 149:
To use something wrongly, or illegally