verb
-verts; -verted; -verting
[+ obj] to change (something good) so that it is no longer what it was or should be
to cause (a person or a person's mind) to become immoral or not normal
pervert justice
or pervert the course of justice
Brit :to try to stop the police from learning the facts about a criminal case
noun
plural -verts
[count] :a person whose sexual behavior is considered not normal or acceptable
US