Also whay. [Cf. WO int.] A call to a horse to stop.

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1836.  Dickens, Sk. Boz, Tuggs’s at Ramsgate. Away went the donkey … ‘Way-way! Wo-o-o-o-!’ cried Mr. Cymon Tuggs. Ibid. (1846), Cricket on Hearth, ii. ‘Way!’ This monosyllable was addressed to the Horse, who didn’t mind it at all. ‘Oh do Way, John!’ said Mrs. Peerybingle. ‘Please!’

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1856.  Miss Yonge, Daisy Chain, I. xv. Whay! Stop. There’s an old woman in here.

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