noun / verb
flow
FLOH/flˈoʊ/
Continuous movement in a stream.
Water flows steadily between the smooth stones in the stream.

Etymology
Old English flowan described streaming, melting, and overflowing. Liquid movement remains central to flow, and provides the comparison when other things move steadily and continuously.
In context
And carbon dioxide, for example, will move from the body cells into the capillaries where it will flow back to the heart, and it can be removed from the body.
More examples
- Cool air flows through the open windows.
- Her questions interrupt the flow of our conversation.
- Her menstrual flow is heavier on the second day.
Forms
flow · flows · flowed · flowing
outflow noun — Movement of fluid out of a place.