Definition of backflow in English:

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backflow

Pronunciation: /ˈbakfləʊ/

Entry from British & World English dictionary

noun

[mass noun]
The movement of liquid or air back in the direction it was flowing from: when filling the tank, use an anti-siphon device to prevent backflow the valves prevent backflow of blood into the veins
More example sentences
  • Veins in the legs have valves which normally prevent any backflow of the blood on its way towards the heart.
  • The reverse flow of electricity or "backflow" can injure an unsuspecting utility worker.
  • Install a backflow valve to prevent sewer backup from coming into your home.
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