menace-n; 2 Senses

Sense Number 1: a source or cause of danger

Commentary: MENACE[+cause][+effective][+danger] [+relation][+role][+agent][+danger]

The judge told him he was a menace to society with his driving record.
The snakes were a menace to farm animals in that region.
The author describes what she sees as the growing menace of nuclear proliferation around the world.
John's kid sister, whom we remembered as a chatty little menace, had become a beauty and accomplished violinist. (humorous extension of core meaning)

WordNet 3.0 Sense Numbers: 1

Sense Number 2: a threatening gesture or expression

Commentary: MENACE[+quality][+gesture][+threatening][+speech/+posture]

He spoke the words with a hint of menace in his voice.
There was an air of menace about the youths as they swaggered down the street.
We detected no menace in the border guards at the security checkpoint.

WordNet 3.0 Sense Numbers: 2