The story
- Old English · inherited fromǣlċ ōþer“each other”
- Middle English · inherited fromech other
- English todayeach other
From Middle English ech other, yche othere, ich othir, eche other, ilk oþer, from Old English ǣlċ ōþer (“each other”), equivalent to each + other. Cognate with Scots ilk other (“each other”), West Frisian elkoar (“each other”), Dutch elkander, elkaar (“each other”).
Etymology from Wiktionary, CC BY-SA 4.0.