Meaning

• The killing of a considerable number (usually limited to people) where little or no resistance can be made, with indiscriminate violence, without necessity, and contrary to civilized norms.

• Murder.

• Any overwhelming defeat, as in a game or sport.

Meaning

• To kill in considerable numbers where little or no resistance can be made, with indiscriminate violence, without necessity, and contrary to civilized norms. (Often limited to the killing of human beings.)

• To win so decisively it is in the manner of so slaughtering one's opponent.

• To give a performance so poorly it is in the manner of so slaughtering the musical piece, play etc being performed.