Where does “impignare” come from?

impignare (Late Latin) comes from Latin pignus, from Proto-Indo-European peh₂ǵ- — to attach.

Ancestry of “impignare”, step by step

Step	Language	Word	Meaning
1	Latin	pignus	pledge, mortgage; hostage; wager, stake
2	Proto-Indo-European	peh₂ǵ-	to attach

impignare — Etymology, Origin & Word History | Etymology Explorer