A Verbal Modifier to change the duration of a Verbal. When you hear this word in front of a Verbal, it means the effect doesn't last as long as it normally would. From the Accelerant core rules:

"Someone precedes an attack verbal with "Short" and calls out an effect that lasts until you rest or lasts for the entire event. That effect instead lasts until you rest for 10 seconds. If used with Frenzy then the effect will only last 10 seconds."