One of the mysteries of the English language finally explained.
Travelling on foot; walking. Chiefly in "on footback": on foot; by walking; compare "afoot-back".
Of a person: that travels on foot. Also of travel, a journey, etc.: made on foot; characterized by walking.
Late 16th century; earliest use found in Thomas Nashe (d. c1601), writer. From foot + back, punningly after horseback [adverb].
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