Pedantic killer post!
Oxford English Dictionary entry -
D. adj.
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(Usu. with hyphens). Executed, as movement, in opposite directions alternately; alternating, reciprocating; characterized by, or characterizing, such movement; passing to and fro.
1749 J. Cleland Mem. Woman of Pleasure I. 212 The sweet urgency of this to-and-fro friction.
1839 H. T. De la Beche Rep. Geol. Cornwall xv. 580 This to-and-fro motion.
1856 S. T. Dobell Eng. in Time of War 70 The to and fro storm of the never-done hurrahing.
1878 T. H. Huxley Physiogr. 146 The regular to-and-fro motion of the water in its estuary.
1898 T. C. Allbutt et al. Syst. Med. V. 755 As a rule pericardial friction-sound has a double, or to-and-fro rhythm.
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E. v.
(only in pres. pple. and vbl. n. toing and froing, rarely to-and-froing).
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a. intr. To pass to and fro, to go hither and thither.
1847 Le Fanu T. O'Brien 108 The clatter and bustle, the‥toing and froing of the soldiery.
1872 J. S. Le Fanu In a Glass Darkly I. 272 There were clerks to-ing and fro-ing.
1888 Morris King's Lesson (1890) 137 Unto him the King gave the job of toing and froing up and down the hill with the biggest dung-basket.
1904 Westm. Gaz. 28 Nov. 2/2 Why all this secrecy about these to-ings and fro-ings?