floodgate
noun/ˈflʌdˌɡeɪt/
Frequency rank: #19,720 most common English word
Meaning
a gate used to control the flow of water; often used figuratively to mean something that, when opened, releases a large amount of something previously held back.

Example sentence
Lowering taxes opened floodgate that allowed money to flow freely into the economy.
Synonyms & related words
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