(plural butter bars)
Derived from the insignia of an O-1 in the US Military, which consists of a single yellow bar.
"butter-bar." YourDictionary, n.d. Web. 07 December 2018. <https://www.yourdictionary.com/butter-bar>.
butter-bar. (n.d.). Retrieved December 07th, 2018, from https://www.yourdictionary.com/butter-bar
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