the world > movement > motion in a certain direction > backward movement > move backwards [verb (intransitive)] > return towards point of departure > flow back (5)
intransitive. Chiefly Medicine. To flow back, to reflux; spec. (of blood) to flow backward through a heart valve. Also figurative.
intransitive. In extended use.
intransitive. To flow back, ebb.
intransitive. To gush or flow back again. Obsolete.
transitive. To stream back or again (in various senses).