from the GNU version of the Collaborative International Dictionary of English
- adv. Back to back.
- n. A sofa, open carriage, or the like, so constructed that the occupants sit back to back.
from The Century Dictionary and Cyclopedia
- n. Back to back; specifically, in dancing, an evolution in reels, etc., in which two persons advance, pass around each other back to back, and return to their places.
Sorry, no etymologies found.