From SuspireWiki

(v., slang)

To cause or allow a domain’s mortal population to fall sick or otherwise succumb to infirmity (or overhunting). To spread, or allow to spread, a disease or drug epidemic. Often paired with gutter (q.v.). “Call it what you want, but if you let the cattle grippe themselves with STDs and smack, the Prince is going to call it you been gripping them.”