backflow
noun
back·flow ˈbak-ˌflō 
: a flowing back or returning especially toward a source
Example Sentences
Recent Examples on the Web This technique — in which a boat reverses its engine and the backflow creates a channel to free the dolphins — and subsequent refinements resulted in the release of 95 percent of the dolphins caught in the nets. 
Michael A. Gardiner, San Diego Union-Tribune, 8 June 2022 Check valves allow gas or liquid to flow in one direction to prevent backflow. Ashley Strickland, CNN, 14 Apr. 2022 May 7, 2021 Lowlights: - Raw wings found to be prepped inside three compartment sinks that were compromised by a backflow of sewage from adjacent drain coming from dish washing machine. Ryan Serpico, San Antonio Express-News, 19 Jan. 2022 In 1920, Serbian-American inventor Nikola Tesla designed a device without any moving parts that allows fluid to move in one direction while preventing backflow. Rachael Lallensack, Smithsonian Magazine, 29 Dec. 2021 The regurgitation, or backflow, of blood from William’s existing valve leak had risen sharply — and contributed to a new leak in another valve, his mother said. Erin Alberty, The Salt Lake Tribune, 7 Nov. 2021 The corners of the box fan can create a backflow, which can reduce performance. Maggie Menderski, The Courier-Journal, 16 Sep. 2021 There is no backflow, so the water will always stay clear. Chris Hachey, BGR, 28 June 2021 Local insurance agent Ray Sandoval was leery about having let a city Water Works employee inside his office to check his backflow preventer the day before the city’s public announcement. Christian Sheckler, Indianapolis Star, 6 Apr. 2020 See More
Michael A. Gardiner, San Diego Union-Tribune, 8 June 2022 Check valves allow gas or liquid to flow in one direction to prevent backflow. Ashley Strickland, CNN, 14 Apr. 2022 May 7, 2021 Lowlights: - Raw wings found to be prepped inside three compartment sinks that were compromised by a backflow of sewage from adjacent drain coming from dish washing machine. Ryan Serpico, San Antonio Express-News, 19 Jan. 2022 In 1920, Serbian-American inventor Nikola Tesla designed a device without any moving parts that allows fluid to move in one direction while preventing backflow. Rachael Lallensack, Smithsonian Magazine, 29 Dec. 2021 The regurgitation, or backflow, of blood from William’s existing valve leak had risen sharply — and contributed to a new leak in another valve, his mother said. Erin Alberty, The Salt Lake Tribune, 7 Nov. 2021 The corners of the box fan can create a backflow, which can reduce performance. Maggie Menderski, The Courier-Journal, 16 Sep. 2021 There is no backflow, so the water will always stay clear. Chris Hachey, BGR, 28 June 2021 Local insurance agent Ray Sandoval was leery about having let a city Water Works employee inside his office to check his backflow preventer the day before the city’s public announcement. Christian Sheckler, Indianapolis Star, 6 Apr. 2020 See More Word History
First Known Use
1878, in the meaning defined above