turn

turn
turn against 背叛，
例如：Why did you turn against him? 你为何背叛他？?
turn in 自首，
例如：You must turn yourself in. 你必须去自首！
turn back 倒退，
例如：You can’t turn back time. 你不能让时光倒流！
I wish I could turn back 5 years.