Usage patterns
〈場所〉の後ろに〈物〉があるthere is something behind a place
There's a car behind the house.
後ろを向くto turn around, to face backward
He turned around and laughed.
後ろに下がるto step back, to move backward
Please step back one step.
後ろから〈動詞〉to do something from behind
I was called out to from behind.
〈人〉の後ろに立つto stand behind someone
I stood behind the teacher.
Expressions
手が後ろに回るbe arrested; have one's hands tied behind one's back 後ろ髪を引かれるfeel a painful reluctance to leave; have one's hair pulled from behind (lit.) 敵に後ろを見せるflee from the enemy; turn tail · expose one's weakness to an adversary