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English definition of “to and fro”

to and fro

adverb [before noun], adjective    
in one direction and then in the opposite direction, a number of times: I was disturbed by all the people walking to and fro outside the office. She was gazing out the window, rocking rhythmically to and fro.Backwards, sideways and back and forth
(Definition of to and fro adverbadjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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