a person who treats with irreverence or disregard or who violates or sullies the instructions order etc. of, one's teacher, parent, elder, etc.

a man who slaughters or commits a massacre.

the act of treating one's teacher with irreverence or contempt; to desecrate one's relation with or cheat, his or her teacher, parent, elder or venerable person (which is considered as one of the heinous sins).