Definition of swan-upping in US English:

swan-upping

noun

  • The annual practice of catching the swans on the River Thames and marking them to indicate ownership by the Crown or a corporation.

    • ‘This photograph of 1900 shows the annual swan-upping ceremony that takes place in July.’
    • ‘After swan-upping, the Dyers and Vintners settle down to a banquet - with roast swan on the menu.’

Pronunciation

swan-upping

/ˈswɑn ˌəpɪŋ//ˈswän ˌəpiNG/