The story
- Proto-Indo-European · derived from*dreb-
- Proto-Germanic · derived from*trap-
- Old English · derived fromtræppe /treppe“trap, snare”
- Medieval Latin · borrowed from*trappa
- English todaytrape
Perhaps via Medieval Latin *trappa, from Old English træppe /treppe (“trap, snare”), from Proto-Germanic *trap-, from Proto-Indo-European *dreb-, from *der- (“to walk, step”).
Etymology from Wiktionary, CC BY-SA 4.0.