Meaning of the word killer in English

What does killer mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

killer

US /ˈkɪl.ɚ/
UK /ˈkɪl.ər/

Noun

a person or thing that kills

Example:
The police are still searching for the killer.
Smoking is a known killer.

Adjective

extremely difficult or impressive

Example:
That was a killer workout!
She gave a killer performance on stage.