In modern Chinese you will most often see this as 参加 can1jia1 to participate.
This character literally means ginger shen1 and is apparently also an ancient term for clique, party, fringe element. It thus can also carry the connotation of radical extremist fringe element depending on context. The shadow character at the bottom 彡 shan is the image of light beams and shadows. The middle character is a stretched out 大 da which means big. The top character is 厶 si which means personal private secret. So the character’s idea may be private persons secretly assembling into a large shadowy group.
Now JOIN PARTICIPATE
擦 安 参 Ca-An Can = wipe peace PARTICIPATE
Linkwords: Sane, Can