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English definition of “to and fro”

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to and fro

adverb [before noun], adjective uk   us  
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.
(Definition of to and fro from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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