名词

1. 杀人者；杀手
A killer is a person who has killed someone, or who intends to kill someone.

2. 导致死亡的事物
You can refer to something that causes death or is likely to cause death as a killer .

1. predatory black-and-white toothed whale with large dorsal fin
common in cold seas

Synonym: killer whaleorcagrampussea wolfOrcinus orca

2. a difficulty that is hard to deal with

e.g. that exam was a real killer

3. someone who causes the death of a person or animal

Synonym: slayer

4. the causal agent resulting in death

e.g. heart disease is the biggest killer in the United States

Synonym: cause of death