the unnecessary, indiscriminate killing of a large number of human beings or animals, as in barbarous warfare or persecution or for revenge or plunder.

a general slaughter, as of persons or animals

the massacre of millions during the war.

Informal . a crushing defeat, esp. in sports.

to kill unnecessarily and indiscriminately, esp. a large number of persons.

Informal . to defeat decisively, esp. in sports.

noun

butcher , cutthroat , homicide , killer , manslayer , murderess , slaughterer , slayer , triggerman