floodgate

Noun
  1. Something that restrains a flood or outpouring (synset 106257997)
    "suspension of surveillance opened the floodgates to illegal immigrants"
    is a type of: restraint - a rule or condition that limits freedom
  2. Regulator consisting of a valve or gate that controls the rate of water flow through a sluice (synset 104251743)
    is a type of: regulator - any of various controls or devices for regulating or controlling fluid flow, pressure, temperature, etc.
    is a part of: penstock, sluice, sluiceway - conduit that carries a rapid flow of water controlled by a sluicegate
    same as: head gate, penstock, sluice valve, sluicegate, water gate

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