Where does “dope” come from?

dope (Dutch) comes from Middle Dutch dôpen, from Old Dutch dōpen, from Frankish daupijan, from Proto-Germanic daupijaną, from Proto-Indo-European dʰewb- — deep, hollow; depths, hollow, deep, bottom.

Definitions

Ancestry of “dope”, step by step

Step	Language	Word	Meaning
1	Middle Dutch	dôpen	—
2	Old Dutch	dōpen	to dip, to immerse
3	Frankish	daupijan	to dip, to immerse
4	Proto-Germanic	daupijaną	to dip in a liquid, to immerse
5	Proto-Indo-European	dʰewb-	deep, hollow; depths, hollow, deep, bottom

Every word from Proto-Indo-European dʰewb- →Every word from Proto-Germanic daupijaną →Every word from Frankish daupijan →