柯林斯詞典turning circle 1. N the smallest circle in which a vehicle can turn 回轉(zhuǎn)圓 返回 turning circle劍橋詞典the amount of space a vehicle needs in order to go round in a complete circle （車輛等掉頭用的）回轉(zhuǎn)空間，轉(zhuǎn)向圓 返回 turning circle