What's the difference between i.e. and e.g.?
c.1300, "foot soldier;" late 14c., "one who goes on foot;" as a personal attendant, originally one who ran before or alongside his master's carriage, announcing its arrival (and keeping it from tipping over). The modern, non-jogging servant sense is from c.1700, though the running footmen still were in service mid-18c. From foot (n.) + man (n.).