what figure of speech is this?

[Anonymous]

What part of speech is this sentence?
As for work, we haven't any of any consequence. We have the Saint Vitus' dance, and cannot possibly keep our heads still.

 

[RonBee]

Since a sentence can't be a part of speech, I don't know how to answer your question.

 

[RonBee]

Saint Vitus' dance

Saint Vitus' dance
http://dictionary.reference.com/search?q=Sydenham's chorea