Real Dictionary

swan
countable noun: A swan is a large bird with a very long neck. Swans live on rivers and lakes and are usually white.
verb: If you describe someone as swanning around or swanning off, you mean that they go and have fun, rather than working or taking care of their responsibilities.

swan in American English 1
any of several large-bodied, web-footed waterfowl (family Anatidae, esp. genus Cygnus) with a long, graceful neck and, typically, pure white feathers: swans are graceful swimmers and strong fliers
to move slowly or majestically, with a calm, serene air
noun: any of several large, stately aquatic birds of the subfamily Anserinae, having a long, slender neck and usually pure-white plumage in the adult

swan in American English 2
to swear
intransitive verb: to swear or declare (used with I)

swan in British English
noun: any large aquatic bird of the genera Cygnus and Coscoroba, having a long neck and usually a white plumage: family Anatidae, order Anseriformes

Swan in British English 1
noun: a river in SW Western Australia, rising as the Avon northeast of Narrogin and flowing northwest and west to the Indian Ocean below Perth. Length: about 240 km (150 miles)

Swan in British English 2
noun: Sir Joseph Wilson. 1828–1914, English physicist and chemist, who developed the incandescent electric light (1880) independently of Edison