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"U.S. soldier," 1864, American English, said to have been in oral use from 1854, or from the Mexican-American War (1847), it is perhaps from resemblance of big buttons on old uniforms to a sort of biscuit of that name (1680s), but there are various other conjectures.
United States infantry soldiers who served in World War I.
An infantry soldier; grunt, paddlefoot
[1867+; origin unknown; perhaps fr a resemblance between the buttons of the infantry uniform and doughboys, ''suet dumplings boiled in seawater,'' a term fr the British merchant marine]