turn意思是转变，head指的是头脑思想，所以turn one's head直译就是改变人的头脑思想、回首。

【例句】
Turn one's head suddenly, it is the spring breeze that is running behind, wave the plain woman of sleeves, offend the drunk heart that I sought among the brimming pupil.
蓦然回首，身后是春风在奔跑，挥舞著衣袖的素女，盈盈眸间惹醉我寻觅的心。

Turn one's head goes we are clinking excitement and proud, look into future we are confident with force.
一元复始，万象更新。回首过去我们无比兴奋和自豪，展望未来我们充满信心和力量。