To kill in English is to "murder" someone. This word comes from the Latin word "mors" which means "death." Here are some examples of how this word is used in English:

The killer murdered the victim with a knife.

She was accused of murdering her husband.

The murder took place in the early hours of the morning.

In these examples, "murder" is used as a verb to refer to the act of killing someone. It is also sometimes used as a noun to refer to the crime of killing someone, as in "the murder was committed in cold blood."