灭口

灭口	miè kǒu	to kill sb to prevent them from divulging a secret / to silence sb
灭	miè	to extinguish or put out / to go out (of a fire etc) / to exterminate or wipe out / to drown
口	kǒu	mouth / classifier for things with mouths (people, domestic animals, cannons, wells etc) / classifier for bites or mouthfuls