floodgate

(fludgāt′)

noun

  1. a gate in a stream or canal, to control the height and flow of the water; sluice
  2. anything like this in controlling a flow or an outburst

See floodgate in American Heritage Dictionary 4

noun
  1. A gate used to control the flow of a body of water. Also called water gate.
  2. Something that restrains a flood or outpouring: The ruling opened the floodgates to refugees seeking asylum.

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