Lafazin “Buck Private” kalma ce ta soja wacce take nufin mafi ƙanƙanta matsayi a cikin soja, wanda yawanci keɓaɓɓe ne. An yi imani da kalmar "Buck" ta fito ne daga kalmar Faransanci "buccaneer," wanda ke nufin wani nau'in ma'aikacin jirgin ruwa wanda galibi ana ɗaukarsa a matsayin ƙananan aji kuma ba shi da gogewa fiye da sauran ma'aikatan jirgin.A cikin amfani na zamani, Kalmar “Buck Private” na iya nufin duk wanda bai da kwarewa ko kuma mai karamin matsayi, ba wai kawai wadanda ke cikin soja ba. Hakanan ana iya amfani da shi azaman ɗan ƙaranci ga wanda ake gani a matsayin butulci ko maras fahimta.