Where does “butterfly knife” come from?

butterfly knife (English) comes from English Butterfly, from Middle English boterflye, from Old English buterflēoge, from Old English butere, from Proto-West Germanic buterā, from Latin būtȳrum, from Ancient Greek βούτυρον, from Ancient Greek τυρός — to swell; to crowd; to be strong.

butterfly knife (English): A folding pocket knife with two handles...

Definitions

  1. A folding pocket knife with two handles...

Ancestry of “butterfly knife”, step by step

butterfly knife traces back through two separate lines of ancestry.

via English Butterfly

StepLanguageWordMeaning
1EnglishButterflyA flying insect of the order Lepidoptera, distinguished from moths by their diurnal activity and generally brighter colouring
2Middle Englishboterflyebutterfly; Something of little import or value; A...
3Old Englishbuterflēogebutterfly
4Old Englishbuterebutter
5Proto-West Germanicbuterābutter
6Latinbūtȳrumbutter
7Ancient Greekβούτυρονbutter
8Ancient Greekτυρόςcheese
9Proto-Hellenictūróscheese
10Proto-Indo-Europeantuh₂-ró-s
11Proto-Indo-Europeantewh₂-to swell; to crowd; to be strong

via English knife

StepLanguageWordMeaning
1EnglishknifeA utensil or a tool designed for cutting,...
2Middle EnglishknyfA knife as a tool or instrument; the following...
3Old Englishcnīfknife
4Old Norseknífrknife
5Proto-Germanicknībazpincers; shears; knife
6Proto-Germanicknīpanąto pinch
7Proto-Indo-Europeanǵneybʰ-
Every word from Proto-Indo-European tewh₂-Every word from Proto-Indo-European tuh₂-ró-sEvery word from Proto-Hellenic tūrós