floodgate
noun/ˈflʌdɡeɪt/
/ˈflʌdɡeɪt/
[usually plural]- 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 something that will be difficult to stop).
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floodgate