We all know a buttonhole as the gap in a coat through which you're supposed to push a button. Its etymology seems simple, right? Button and hole? Well, it is simple, but that's incorrect. Buttonhole actually used to be the spelling, and it meant "a looped string through which a button goes". The new name got applied through folk etymology; people associated the loop with a hole, thought hold should actually be spelled hole, and changed it. Buttonhole designs evolved too, giving us our modern prototype of the word. Weird. NOW we etymologize button: possibly through French, it traces to the Proto-Germanic term buttan, from Proto-Indo-European bhau, a word that meant "to thrust" since buttons jut out. Hold, through Middle English holdan, Old English haldan, and Proto-Germanic haldan, ultimately derives from the Proto-Indo-European root kel, which meant "to shepherd" or "drive" under the connection of livestock.
Adam Aleksic, a freshman studying linguistics at Harvard University, has been described as the internet's sixth most famous etymologist. He has disturbing interests in words, vexillology, geography, board games, limericks, and law, and he loves writing about himself in the third person.
The Etymology Nerd