/ˈflʌdɡeɪt/
flood·gate
BrE /ˈflʌdɡeɪt/
NAmE /ˈflʌdɡeɪt/
[usually pl.]
a gate that can be opened or closed to control the flow of water on a river
(figurative) If the case is successful, it may open the floodgates to more damages claims against the industry (= start sth that will be difficult to stop).