Happen upon and Run across

Happen upon verb - To come upon face-to-face or as if face-to-face.

Run across and happen upon are semantically related in lay hands on topic. In some cases you can use "Run across" instead a verb "Happen upon".

Run across verb - Come together.

Happen upon and run across are semantically related in lay hands on topic. You can use "Happen upon" instead a verb "Run across".