Mǎ jiáozi shàng de biāo kòngzhì zhe mǎ de fāngxiàng.
The bit on the horse's bridle controls the horse's direction.
Tips
usage
镳 appears most commonly in the idiom 分道扬镳 (fēndào yángbiāo), meaning to part ways — literally, to go separate roads and wave one's bridle bits apart. The standalone word is rarely used outside of this phrase.