flood·gate /ˈflʌdˌget/
水門,水閘,防潮水閘
floodgate
n 1: something that restrains a flood or outpouring; "suspension
of surveillance opened the floodgates to illegal
immigrants"
2: regulator consisting of a valve or gate that controls the
rate of water flow through a sluice [syn: sluicegate, sluice
valve, penstock, head gate, water gate]