E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Go out (To).
To rise in rebellion; the Irish say, To be up. To go out with the forces of Charles Edward. To be out with Roger More and Sir Phelim ONeil, in 1641.
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I thocht my best chance for payment was een to gae out myself.Sir W. Scott: Waverley, 39.