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Like Lord Thomond’s cocks, all on one side. Lord Thomond’s cock-feeder, an Irishman, being entrusted with some cocks which were matched for a considerable sum, the night before the battle shut them all together in one room, concluding that as they were all on the same side, they would not disagree: the consequence was, they were most of them either killed or lamed before the morning.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Thirteener * ThomasNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes
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Francis Grose was independently wealthy, having inherited money from his father, a jeweller. Finding himself overspending, he published a number of books; his Provincial Glossary seems to have been the starting-point for the Vulgar Tongue reproduced here.