E. Cobham Brewer 1810–1897. Dictionary of Phrase and Fable. 1898.
Hark Back (To).
To return to the subject. “Revenons à nos moutons” (q.v.). A call to the dogs in fox-hunting, when they have overrun the scent, “Hark [dogs] come back”; so “Hark for’ards!” “Hark away!” etc.
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