: a flowing back or returning especially toward a source
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The back-of-house hose was found incorrectly attached with no backflow preventor or air gap, causing potential dirty water to come back up from the sink.—Paige Moore, AZCentral.com, 1 Apr. 2026 At mop sink, backflow preventer missing on non chemical dispenser side of splitter with red hose attached.—Staff Reports, Florida Times-Union, 24 Mar. 2026 The facility lacked a backflow prevention device in the mop sink.—Veronica Fernandez-Alvarado
february 13, Sacbee.com, 13 Feb. 2026 This also results in a loss of water pressure within the distribution system, and that could lead to contamination entering the system through backflow or back siphonage.—Patrick Damp, CBS News, 7 Feb. 2026 See All Example Sentences for backflow