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Definition of backflow
: a flowing back or returning especially toward a source
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Recent Examples of backflow from the Web
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The backflow also temporarily created the tallest waterfall recorded in the state of Louisiana, at 150 to 164 feet, depending on the source.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'backflow.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
First Known Use of backflow
1878
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