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From Middle English tongue, a late spelling of tong(e), tung(e), from Old English tunge, from Proto-West Germanic *tungā (“tongue”), from Proto-Germanic *tungǭ (“tongue”), from Proto-Indo-European *dn̥ǵʰwéh₂s (“tongue”). Doublet of langue and lingua. Cognates Germanic: West Frisian tonge, Dutch tong, Luxembourgish Zong, German Zunge, Danish, Norwegian Bokmål, and Norwegian Nynorsk tunge, Faroese, Icelandic, and Swedish tunga, Gothic 𐍄𐌿𐌲𐌲𐍉 (tuggō). Italic: Asturian and Catalan llengua, Aragonese luenga, French langue, Galician, Italian, and Latin lingua, Leonese llingua, Mirandese lhéngua, Portuguese língua, Spanish lengua. Celtic: Irish teanga. Slavic: Belarusian and Russian язык (jazyk), Bulgarian ези́к (ezík), Czech and Slovak jazyk, Macedonian јазик (jazik), Polish język, Serbo-Croatian jèzik (“tongue”), Slovene jézik, Ukrainian язи́к (jazýk). Indo-Iranic: Persian زبان (zabân), Sanskrit जि॒ह्वा (jihvā́). The expected modern spelling, both phonetically and etymologically, would be tung. Using ⟨on⟩ for ⟨un⟩ was fairly common in Middle English; compare e.g. yong (“young”). The final ⟨gue⟩ arose to prevent tonge being misread with a soft /dʒ/. However, this spelling only became common at a time when the final ⟨e⟩ was already largely silent, so it is not clear why it was not simply dropped instead. Perhaps the spelling was influenced directly by French langue (“tongue”).