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English definition of “open the floodgates”

open the floodgates

If an action or a decision opens the floodgates, it allows something to happen a lot or allows many people to do something that was not previously allowed: Officials are worried that allowing these refugees into the country will open the floodgates to thousands more.
(Definition of open the floodgates from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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