The phrase "ran abreast" refers to two or more things or individuals moving side by side. Some other phrases that can be used as synonyms for this term include "moved alongside," "proceeded parallel," "travelled in tandem," "advanced together" and "operated alongside." These terms can be used to describe situations in which two or more people or objects are moving in the same direction, at the same speed and in close proximity to one another. Whether it's competing boats in a race, a pair of runners on a trail or two cars on a highway, these phrases help to vividly describe the action and movement.