The story
- Proto-Indo-European*gel-
- Proto-Indo-European*gól-
- Proto-Germanic*kalaną
- Proto-Germanic*kōluz
- Proto-West Germanic*kōl(ī)
- Proto-West Germanic*kōlēn
- Old Englishcōlian
- Middle Englishcolen
- Englishcool
- English todaycooled
Etymology from Wiktionary, CC BY-SA 4.0.