#tidal_flow__tidalflow__tidal_current__tidalcurrent  the water current caused by the tides
  supertype:  current__stream  a steady flow (usually from natural causes); "the raft floated downstream on the current"; "he felt a stream of air"
  subtype:  tidal_bore  a high wave (often dangerous) caused by tidal flow (as by colliding tidal currents or in a narrow estuary)
  part of:  tide  the periodic rise and fall of the sea level under the gravitational pull of the moon

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