poilu (n.)youdaoicibaDictYouDict[poilu 词源字典]
French private soldier, 1914, from French poilu, literally "hairy," from poil "hair," not of the head, but of beards, animal coats, etc., from Latin pilus (see pile (n.3)). In 19c. French the adjective had a secondary sense of "strong, brave, courageous" (Balzac).[poilu etymology, poilu origin, 英语词源]