Floodgates are gates that hold back water, and the phrase for releasing a rush. Open the floodgates.
The real ones are on rivers and reservoirs and are opened slowly and on purpose. Opening the floodgates now nearly always means a rush of complaints or claims.
1nounfloodgatesGates that hold back water, and the phrase for releasing a rush.
“The ruling opened the floodgates to ten thousand claims.”
floodgates is a gate.
Middle English
flodegate
English
floodgate
English, today
floodgates
floodgate comes from Middle English flodegate, flodgate, flodeyate, floodȝate, flodȝete, equivalent to flood + gate.
Etymology from Wiktionary, CC BY-SA