Where does “intergern” come from?

intergern (English) comes from English inter-, from Latin inter- — inter-.

intergern (English): To exchange grins or snarls

Definitions

Step	Language	Word	Meaning
1	English	inter-	between, amid, among, during, within, mutual,...
2	Latin	inter-	inter-

intergern — Etymology, Origin & Word History | Etymology Explorer