Slow motion is an effect in film-making whereby time appears to be slowed down. It was invented by the Austrian priest August Musger in the early 20th century.

Is it slow-mo or slow-mo?

Slow motion (commonly abbreviated as slo-mo or slow-mo) is an effect in film-making whereby time appears to be slowed down. ... When replayed at normal speed, time appears to be moving more slowly.

What does slow-mo means?

: of, relating to, or being motion-picture or video photography in which the action that has been photographed is made to appear to occur slower than it actually occurred a slow-motion replay also : slowly moving a slow-motion dance. slow motion.