Man-at-arms
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Man-at-arms was a medieval term for a warrior or soldier, usually a professional. It was most often used to refer to men in a knight's or lord's retinue who were well-equipped and -trained (deriving from having men under arms - meaning to be trained in the use of arms).
It was also used to refer to a man who carried hand-weapons into combat during the medieval period (rather than billmen, spearmen or archers).
When used in allusion to a professional soldier in a regular national army, the term is an honorary denotation and could be considered unusual usage.