We get our word vinegar from the French word vinaigre, which had the same meaning as today's term. This is actually a portmanteau, that of vin, meaning "wine", and aigre, meaning "sour". It sort of makes sense if you think about vinegar as sour wine; it is fermented, and red wine vinegar is a thing. Vin is from the Latin word vinum, from the Proto-Italic word winom, from the Proto-Indo-European root woyhnom, which still meant "wine". Meanwhile, the word aigre was coming from the Latin word acer, which had several definitions, including "sharp", "bitter", and "sour". This, through Proto-Italic akris, derives from the Proto-Indo-European reconstruction hkros, which also meant "sharp". Now here comes the interesting part: remember aigre, which meant "bitter"? That came into English as a word that had a definition more like "fierce" or "angry", which later evolved into our word eager, which developed under a correlation of "powerful emotions".
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Hello! I'm Adam Aleksic. This year, I graduated from Harvard University with a degree in Government and Linguistics. There, I co-founded the Harvard Undergraduate Linguistics Society and wrote a thesis on Serbo-Croatian language policy, magna cum laude. In addition to etymology, I also really enjoy trivia, politics, vexillology, geography, board games, conlanging, art history, and law.