This allows blood to flow backwards and they enlarge even more.

We've got valves in our veins, to keep blood from flowing backwards.

She seemed to flow backwards into the shadows.

The river flows backwards at times depending on the dam.

The tide was coming in and the river flowed backwards, slapping against the wall farbelow her feet.

"I think even the Communists now agree that no river can flow backwards."

In modeling the coalescent process, time is usually considered to flow backwards from the present.

Use two extra cases to create a steep top step so that the CO2 won't flow backwards.

It allows current to flow backwards with small negative voltages.

The blood then flows backwards, at which point the veins then start to increase.