@drop <object> [=<text>]. Sets the drop field of <object> to <text>. If <text> is not specified, the drop field is cleared. The drop message on an object is displayed when you drop it. On an exit, it is displayed upon entering the destination room. On a player it is displayed to whoever kills them. On a room, it is displayed when an object is dropped there. This is the same as '@set <object>=_/dr:[text]'