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
- Patients who have taken those drugs may have changes in their heart valves that cause leakiness and backflow of blood.
- Incorrectly installed systems can waste water and care must be taken not to contaminate mains water supplies through backflow.
- Veins in the legs have valves which normally prevent any backflow of the blood on its way towards the heart.