Source : Webster's Revised Unabridged Dictionary (1913)

Ca ira \[,C]a" i*ra"\ [F. [,c]a ira, [,c]a ira, les aristocrates
   [`a] la lanterne, it shall go on, it shall go on, [hang]the
   arictocrats to the lantern (lamp-post).]
   The refrain of a famous song of the French Revolution.