The story
- Proto-Germanic · inherited from*kuþō
- Old English · inherited fromcoþu“disease, sickness, pestilence”
- Middle English · inherited fromcothe
- English todaycoath
From Middle English cothe, from Old English coþu (“disease, sickness, pestilence”), from Proto-Germanic *kuþō.
Etymology from Wiktionary, CC BY-SA 4.0.