One of the mysteries of the English language finally explained.
A savings scheme run by or on behalf of a government, in which the funds deposited are available for the use of the government; specifically such a scheme instituted in Britain during the First World War (1914–18) (initially under the designation National War Savings).
Early 20th century; earliest use found in Saving. From national + the plural of saving.
National Savings/ˌnaʃ(ə)n(ə)l ˈseɪvɪŋz//ˌnaʃən(ə)l ˈseɪvɪŋz/
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