взад и вперёд betyder på engelska

to and fro▼(back and forth)
adverb
[UK: tuː ənd frəʊ] [US: ˈtuː ænd ˈfroʊ]

up and down▼(alternately forwards and backwards along a path)
adverb
[UK: ʌp ənd daʊn] [US: ʌp ænd ˈdaʊn]