WHY
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A machine in french is feminine. It come from latin machina (μαχανά in Greek) which is feminine (-ina suffix is feminine). Washing is just a verb so it have no influence on the "gender".
A washing machine -> Une machine à laver
Close but wrong. It's because washing is feminine.
All those years of school and lecturing from my teachers only to discover it was all lies.... thank anyway I guess.
Sadly true, Its like an on pourpouse languaje setting