Where does “soft-float” come from?

soft-float (English) comes from English float, from Middle English flote, from Old French flote, from Old Norse floti, from Proto-Germanic flutô, from Proto-Indo-European plewd-, from Proto-Indo-European plew- — to fly, flow, run.

Ancestry of “soft-float”, step by step

soft-float traces back through two separate lines of ancestry.

via English float

StepLanguageWordMeaning
1EnglishfloatOf an object or substance, to be supported by a...
2Middle EnglishfloteAlternative form of floute; Something that...
3Old Frenchflotefleet
4Old Norseflotifleet
5Proto-GermanicflutôA float; flotation device; A raft; boat; ship
6Proto-Indo-Europeanplewd-to fly, flow, run
7Proto-Indo-Europeanplew-to fly, flow, run

via English soft

StepLanguageWordMeaning
1EnglishsoftEasily giving way under pressure; Smooth and...
2Middle Englishsoftesoft
3Old Englishsōftesoftly
4Proto-West Germanicsamftōsoftly, gently
5Proto-West GermanicCreates adverbs from adjectives; Creates agent...
6Proto-Germanic-ly; Forms agent nouns, often from the zero-grade...
7Proto-Indo-EuropeanDerives nouns from roots
Every word from Proto-Indo-European plew-Every word from Proto-Indo-European plewd-Every word from Proto-Germanic flutô
soft-float — Etymology, Origin & Word History | Etymology Explorer