backward and forward
https://gyazo.com/74aa966e3a9bb4ae8c53f8eba13eb946
source:
Hellogoodbye Dance GIF - Hellogoodbye Dance SonlyNatural - Discover & Share GIFs
backward
and
forward
in
both
direction
s
alternately
;
to and fro
: 代わる代わる両方の方向に;前後に
前後に, 行きつ戻りつ
#collocation