Where does “downgradable” come from?

downgradable (English) comes from English downgrade, from English down-, from Middle English down-, from Old English dūne-, from Old English dūne, from Old English adūne, from Old English ofdūne, from Old English dūn — smoke; mist, haze.

downgradable (English): Capable of being downgraded

Definitions

  1. Capable of being downgraded

Ancestry of “downgradable”, step by step

downgradable traces back through two separate lines of ancestry.

via English downgrade

StepLanguageWordMeaning
1EnglishdowngradeA reduction of a rating, as a financial or credit...
2Englishdown-decrease; lower position or direction, literally...
3Middle Englishdown-
4Old Englishdūne-down-
5Old Englishdūnehill; down, downward
6Old Englishadūne
7Old Englishofdūneoff the hill; down
8Old Englishdūnhill, down; hill, dune; hill, mountain
9Proto-Germanic*dūnā
10Proto-Celticdūnomstronghold, rampart
11Proto-Indo-Europeandʰewh₂-smoke; mist, haze

via English able

StepLanguageWordMeaning
1EnglishableEasy to use; Suitable; competent; Liable to
2Middle Englishablecapable, expert, qualified, skilful, competent
3Old Frenchableable; capable
4Latinhabilisable to have/possess/maintain; having sufficient...
5Latin-ilis-ile
6Proto-Italic-elis
7Proto-Indo-European-elis
8Proto-Indo-European-lósForms agent nouns from verbal roots
Every word from Proto-Indo-European dʰewh₂-