from the GNU version of the Collaborative International Dictionary of English
- The refrain of a famous song of the French Revolution.
from The Century Dictionary and Cyclopedia
- will go on’: ça, contr. of cela, that (⟨ce, this, + là, there); ira, 3d pers. sing. fut. (associated with aller, go: see alley), ⟨ L. ire, go.] The earliest of the popular songs of the French Revolution of 1789.
Sorry, no etymologies found.