Green’s Dictionary of Slang

Swan Stream n.

[the city is on the Swan River]

Perth, Australia.

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[UK] advert in ‘Ducange Anglicus’ Vulgar Tongue (1857) 45: One of the top manufacturers of Manchester had cut his lucky, and stepped off to the Swan Stream, leaving behind him a valuable Stock of Moleskin, Cords, Velveteen, Plushes, Swans Downs, &c.