To spring forth, spread abroad.

intransitive. To spread, extend itself; to be diffused.

To gradually reach a wider area or more people; to become prevalent or (more) widely existent… intransitive. Of a condition, quality, emotion…

intransitive. Of an immaterial thing: to travel, spread, or extend over a comparatively large area or field of operation.

intransitive (for reflexive). To extend, be diffused.

intransitive (for reflexive). To diffuse itself, spread. rare.

intransitive. figurative. To filter or diffuse through, into, etc.; to spread gradually or piecemeal over time.

intransitive. transferred. To seep, grow, or spread uncontrollably; to be rampant.