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to turn one's face; to turn around; to look over one's shoulder
名前を呼ばれて後ろを振り向いてみた。
I turned around when my name was called.
彼女は一度も振り向かずに歩き続けた。
She kept walking without turning around.
後ろで大きな音がしたので振り向いた。
I turned around because I heard a sound behind me.