manback en · NOUN
Etymology
Compare horseback.
Meanings
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(uncountable) The back of a man (being ridden, or really or figuratively laden with burdens, as a means of transportation).
Fatigued by riding onhorseback, bedevilled and begrimed by the ride on manback, he presented a pitiable spectacle, and went on his way to Naples in sad plight. Several officers formed a party to Paestum, now known as Pesto, to see the temples so venerable in years that the date of their[…]
1891, Daniel Ammen, The Old Navy and the New, page 205: