Pannierwise

1874, W. Cave Thomas, “On the Centre-rail Railway,” Report of the Forty-Third Meeting of the British Association for the Advancement of Science, Notes and Abstracts, p. 219, This differs from other projects bearing a similar title, in which carriages and engines are swung, pannierwise, on either side of a raised rail, beam, or wire.

Beneath these still solid monuments of the Doges there passes now the befezzed butcher, his bleeding lambs’ carcasses slung from hooks on two boards, which he hangs pannierwise on his pony’s back.

But the captain’s eyes were on their horses—thoroughbreds, although one carried a pack. Her two sizable boxes, not heavy, were affixed pannierwise, and above them were stores—pots and pans, and hay for the horses.