killer

noun

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

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

killer的反义词

e.g. The police are searching for his killers...
警方正在搜捕杀害他的凶手。
e.g. He's a psychopath, a killer.
他是个精神变态杀人者。

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 .

e.g. Heart disease is the biggest killer of men in most developed countries.
在多数发达国家，心脏病是导致人们死亡的头号杀手。

1.

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