1) An inflow 2) Arrival en masse 3) Arriving surge 4) Current event 5) Entry by a crowd 6) Event when a dam breaks 7) Fast entry 8) Flood 9) Implosion 10) Inflow 11) Influx 12) Inpour 13) Inpouring 14) Opposite of an outpouring 15) Police raid phenomenon 16) Sudden entering 17) Sudden mass arrival 18) Sudden, fast mass arrival Found on https://www.crosswordclues.com/clue/inrush