Meaning of “to and fro” in the English Dictionary

british dictionary

"to and fro" in American English

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to and froadverb [ not gradable ]

us /ˈtu ən ˈfroʊ/

in one direction and then in the opposite direction:

Outside my door I could hear people walking to and fro.

(Definition of “to and fro” from the Cambridge Academic Content Dictionary © Cambridge University Press)