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Definition of Swan upping
1. Noun. An annual swan census in Britain in which mute swans on the River Thames are rounded up, caught, marked, and released. ¹
¹ Source: wiktionary.com
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1. Noun. An annual swan census in Britain in which mute swans on the River Thames are rounded up, caught, marked, and released. ¹
¹ Source: wiktionary.com