Speed up.

In music, an accelerando (ahk-say-lay-RAHN-doh) is a steady, measured increase in speed. In a score, the word “accelerando” is followed by an ellipsis stretched to a length that indicates over how many bars this increase is to take place.

Accelerando is a Directive card. It directs the querent to step up the pace, or indicates a time when things are ramping up, or possibly spinning out of control.