to and fro


Concise Oxford English Dictionary © 2008 Oxford University Press:
to and fro/tuːəndˈfrəʊ/
adverb in a constant movement backwards and forwards or from side to side. verb (be toing and froing) be moving to and fro.

■ vacillate between courses of action.

noun constant movement backwards and forwards.
– derivatives
toing and froing noun.
'to and fro' also found in these Oxford entries:

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