匹夫 literally combines 匹 (pǐ), originally a measure word for horses or cloth but here used archaically to mean 'individual' or 'single', and 夫 (fū), meaning 'man' or 'adult male'. Together, 匹夫 means 'common man' or 'ordinary person' — emphasizing someone without special status, power, or distinction. Historically, it carried neutral or slightly humble connotations, though in classical texts it could sometimes imply lack of cultivation or influence.

In modern usage, 匹夫 is mostly literary or rhetorical, appearing in set phrases like 匹夫之勇 (reckless courage of an ordinary man) or in formal speech and writing to evoke humility, shared humanity, or grassroots perspective. It is rarely used in casual conversation and never as a self-deprecating term in everyday contexts — unlike simpler words like 普通人. Its tone is modest but dignified, often evoking Confucian ideals of moral responsibility even among the unremarkable.