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1. To move very quickly out of some place or thing. Despite the connotation of the word "flood," this usage is not limited to water. When our washer broke, water flooded out of the laundry room. Employees flooded out of the building at the sound of the fire alarm.
2. To cause someone or something to move from a place or thing due to a deluge of water. In this usage, a noun or pronoun can be used between "flood" and "out." The water main break flooded out all of the residents on that block.
flood out(of something)
1. Lit. [for water or something that flows] to rush out of something. The water flooded out of the break in the dam.
2. Fig. [for people] to rush out of something or some place. The people flooded out of the theater, totally disgusted with the performance.
To force something out or away from some place due to a current or influx of water: The torrential rains flooded out most of the coastal residents. High tides regularly flood the smaller animals and insects out of spaces between the rocks. We were flooded out by the broken water line.