moving to the left and then to the right and then back again :
He shook his head slowly from side to side.
The ship rolled from side to side.
moving to the left and then to the right and then back again :
He shook his head slowly from side to side.
The ship rolled from side to side.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005