闸(牐)zhá 1.水闸{floodgate; sluice-gate; water-locks}: 开～放水。{open the sluice} 2.把水截住{dam up a stream, river, etc.}: 水流得太猛,～不住。{The water runs too swiftly to dam it up.} 3.制动器的通称{general term for 制动器zhìdòngqì}: 踩～。{step on the brakes} 4.电闸{switch}: 拉～限电。{switch it off to control electricity supply}