Stomach acid flows backwards into the esophagus.
If anything, some foreign tastes flow backwards.
Simultaneously, the polymerized actin filaments themselves often flow backwards relative to the substratum as the cell advances in a process known as 'retrograde flow'.
As blood flows through a valve from one chamber into another the valve closes, preventing blood flowing backwards.
The city has an almost ancient ambiance that leaves a visitor feeling time is flowing backwards and almost nothing will jar the culture or the economy into the contemporary world.
The main and assistant arcs formed a stable swelling under dynamic force balance preventing the liquid metal flowing backwards.
But as the sea encroaches on low, flat land, rivers at times are flowing backwards, laments a local environmental activist.
Thus, the information flows backwards due to the substeps.
You might have noticed the tide flowing backwards.
Some of the river's major tributaries had begun flowing backwards.
