他抖动马缰.He sawed at the reins.手持马缰,拇指在上,小指在下.Hold the reins in your hands with your thumbs on top and pinkies on the bottom.军官勒住马缰, 向老人问路.Pulling his horse in, the officer inquired the way of the old man....

“马缰”的英语可以翻译为：idle rein ...