Question

What is meaning of "flow"?

Answer 1

of a fluid, gas, or electricity move along or out steadily and continuously in a current or stream.

Answer 2

(especially of liquids, gases, or electricity) to move in one direction, especially continuously and easily:
Lava from the volcano was flowing down the hillside.
Many short rivers flow into the Pacific Ocean.
The river flows through three counties before flowing into the sea just south of here.
With fewer cars on the roads, traffic is flowing (= moving forward) more smoothly than usual.
Hope i helped