If you say that someone or something is a menace to other people or things, you mean that person or thing is likely to cause serious harm.

You can refer to someone or something as a menace when you want to say that they cause you trouble or annoyance.

Menace is a quality or atmosphere that gives you the feeling that you are in danger or that someone wants to harm you.

If you say that one thing menaces another, you mean that the first thing is likely to cause the second thing serious harm.