Question

back and forth

Answer 1

moving first in one direction and then in the opposite one:

 

حرکت به عقب و جلو هم زمان- بده بستون- تبادل

Comments

they left phone messages for each other back and left . does your answer fit in this question ?!

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Hi.

Here back and forth carries the idea of sending and receiving messages one after another very quickly.

Answer 2

جلوعقب-رفت و امد

commute back and forth daily

ref. vocabulary 4 the high school

Answer 3

this idiom is used when someone is speaking about something which goes forth and then gets back

in persian language we can say:

جلو و عقب
پس و پیش