柯林斯词典weir /wɪə/ (weirs) 1. N-COUNT A weir is a low barrier built across a river in order to control or direct the flow of water. 堰 返回 weir剑桥词典a wall built under the water across a river , over which the water flows from one level to another in a controlled way 堰；拦河坝 返回 weir