Meanings
Separable verb prefix that indicates removal or quitting, off, away.
ab- + fahren (“to drive”) → abfahren (“to depart, drive away”)
Separable verb prefix that indicates a downward movement, down.
ab- + tauchen (“to dive”) → abtauchen (“to submerge”)
Separable verb prefix that indicates from or of.
Noun prefix that indicates being different from the source or deviation.
ab- + Art (“kind, sort”) → Abart (“variety, variant, anomality”)