The story
- Old English · inherited fromongang“entrance, incursion, irruption, assault, attack; worship”
- Middle English · inherited from*ongang
- English todayongang
From Middle English *ongang, *ongong, from Old English ongang (“entrance, incursion, irruption, assault, attack; worship”), equivalent to on- + gang.
Etymology from Wiktionary, CC BY-SA 4.0.