Boarback

[...] galloping over the [mountain] on boarback (p. 258), were survivals of the legend of the Maenads in their carnivorous ecstasies.

Source: wiktionary

[...] rode on boarback. Cathubodua (Corpus Inscriptionum Latinarum 12.2571) is matched by the ornithomorphous Irish Bodb (catha) '[Battle] Crow' and such other bird-shaped battle-goddesses as Morrigan 'Great Queen'.

Source: wiktionary

[...] for his proposal, on boarback, to the damsel in waiting; she wears an equally elaborate ensemble, delineated by the delicate dashes and strokes of the drypoint needle.

Source: wiktionary

First comes an old woman on boarback, wild haired an bent. Next, a man an woman in a mule cart. She fans flies away from the limp child in her lap. Bringin up the rear, a girl about my age pedals a three-tire trolley. I wait. They pass, too far away to see me[…]

Source: wiktionary