{adv. phr.} Forward and back again and again. * /Father pushed Judy in the swing, and she went to and fro./ * /Busses go to and fro between the center of the city and the city limits/ * /The man walked to and fro while he waited for his phone call./ Compare: BACK AND FORTH.
TO AND FRO
Meaning of TO AND FRO in English
Slang English vocab. Английский сленговый словарь. 2012