Where does “hard-float” come from?

hard-float (English) comes from English hard, from Old French hardi, from Old French hardir, from Frankish hardijan, from Proto-Germanic hardijaną, from Proto-Germanic harduz, from Proto-Indo-European kert-, from Proto-Turkic *keŕ- — to travel, tour.

Ancestry of “hard-float”, step by step

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

via English hard

StepLanguageWordMeaning
1EnglishhardHaving a severe property; presenting difficulty;...
2Old Frenchhardihardy; tough; durable
3Old Frenchhardirto harden
4Frankishhardijanto harden, to make hard
5Proto-Germanichardijanąto make hard, strong; to harden
6Proto-Germanicharduzhard; brave
7Proto-Indo-Europeankert-times; to weave, twist together; time
8Proto-Turkic*keŕ-to travel, tour

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
Every word from Proto-Turkic *keŕ-Every word from Proto-Indo-European kert-Every word from Proto-Germanic harduz