Synonyms and related words :
alternately, aplomb, at right angles, back and forth, backward and forward, backwards and forwards, by turns, completely, every other, exhaustively, hitch and hike, in and out, in rotation, in turns, inside out, make and break, off and on, perpendicularly, plumb, reciprocally, ride and tie, round and round, seesaw, sheer, sheerly, shuttlewise, square, to and fro, turn about