Where does “dampdruk” come from?

dampdruk (Afrikaans) comes from Dutch dampdruk, from Dutch damp, from Middle Dutch damp, from Old Dutch *damp, from Proto-Germanic dampaz, from Proto-Germanic dimbaną, from Proto-Indo-European dʰembʰ- — to be stunned.

dampdruk (Afrikaans): vapor pressure

Definitions

vapor pressure

Ancestry of “dampdruk”, step by step

Step	Language	Word	Meaning
1	Dutch	dampdruk	vapor pressure
2	Dutch	damp	vapour (UK), vapor (US)
3	Middle Dutch	damp	—
4	Old Dutch	*damp	—
5	Proto-Germanic	dampaz	vapor; damp, humid
6	Proto-Germanic	dimbaną	to fog, smoke
7	Proto-Indo-European	dʰembʰ-	to be stunned

Every word from Proto-Indo-European dʰembʰ- →Every word from Proto-Germanic dimbaną →Every word from Proto-Germanic dampaz →