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Definition of backflow

backflow

/ˈbækˌfloʊ/
back · flow
Plural:backflows
•
Past Simple:backflowed
•
Past Participle:backflowed
•
Present Participle:backflowing
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backflow Lexical Profile

backflow Game Scores & Validity

• noun

1

An unwanted flow of liquid, gas, or other substance in the reverse of the normal or intended direction, especially in a plumbing system or a blood vessel.

Example

"The plumber installed a special check valve to prevent the backflow of contaminated water into the main supply line."

Synonyms
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Antonyms
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• verb

1

To flow back in the opposite of the normal or intended direction (of a liquid or gas).

Example

"Without a proper seal, wastewater can backflow into the clean municipal pipes during a sudden drop in pressure."

Synonyms
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• Nearby Words

backfill
backfire
backflip
backflow
backgammon
background
backgrounder

Cite this Entry

Wordmom. (2026). Definition of Backflow. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/backflow
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