To make a threat against someone; to use threats.
He threatened me with a knife.
To menace, or be dangerous.
The rocks threatened the ship's survival.
To portend, or give a warning of.
The black clouds threatened heavy rain.
To be close to equaling or surpassing (a record, etc.)
(of a plant or animal) At risk of becoming endangered in the near future.
Feeling insecure or vulnerable.