The phrase “if looks could kill” is a figure of speech that means someone’s appearance is so intimidating or hostile that it could cause harm. It is often used to describe a person who is angry, disapproving, or threatening.
The phrase has been used in popular culture for centuries, and it has been the title of several songs, including a hit single by the heavy metal band Heart. The phrase is also often used in everyday conversation to describe someone who is intimidating or hostile.