Where does “off keel” come from?

off keel (English) comes from English keel, from Proto-Mongolic kelen, from Old English cēlan, from Proto-West Germanic kōlijan, from Proto-Germanic kōlijaną, from Proto-Germanic kōlaz, from Proto-Germanic kōluz, from Proto-Germanic kalaną — to swallow; swallow.

Ancestry of “off keel”, step by step

off keel traces back through two separate lines of ancestry.

via English keel

StepLanguageWordMeaning
1EnglishkeelA large beam along the underside of a ship’s hull...
2Proto-Mongolickelentongue; language
3Old Englishcēlanto cool, make cool
4Proto-West Germanickōlijanto cool, to make cooler
5Proto-Germanickōlijanąto make cold, to cool
6Proto-GermanickōlazAlternative form of *kōluz; cool, cold; calm
7Proto-Germanickōluzcool
8Proto-Germanickalanąto be cold, to freeze
9Proto-Indo-Europeanǵel-to swallow; swallow

via English off

StepLanguageWordMeaning
1EnglishoffIn a direction away from the speaker or object;...
2Middle Englishofof; off; until
3Old Englishofof, from, off, out of
4Old Englishæfof
5Proto-Germanic*ab
6Proto-Indo-Europeanapó
Every word from Proto-Indo-European ǵel-Every word from Proto-Germanic kalanąEvery word from Proto-Germanic kōluz