The Collaborative International Dictionary
Right-about
Right-about \Right"-a*bout`\, n. [Right, adv. + about, adv.] A turning directly about by the right, so as to face in the opposite direction; also, the quarter directly opposite; as, to turn to the right-about.
To send to the right-about, to cause to turn toward the
opposite point or quarter; -- hence, of troops, to cause
to turn and retreat. [Colloq.]
--Sir W. Scott.
Wiktionary
right-about
n. A 180-degree turn towards the right (especially of troops)