from the GNU version of the Collaborative International Dictionary of English
- n. A yearly expedition on the Thames to take up young swans and mark them, as by Companies of Dyers and Vintners; -- called also swan-hopping.
from The Century Dictionary and Cyclopedia
- n. The custom or practice of marking the upper mandible of a swan, on behalf of the crown, of Oxford University, and of several London companies or gilds.
Sorry, no etymologies found.