An action or situation that threatening is one that seems about to become dangerous or unpleasant. You might feel threatened by someone who's standing too close.
When we talk about something being threatening, it means it makes us feel uneasy or scared. For example, if there are protests happening outside your school, the atmosphere can be threatening and tense. Or if you know a storm is coming with strong winds and rain, that's also a threat.
To make a threat against someone; to use threats.
Example: He threatened me with a knife.
An act of threatening; a threat.
Presenting a threat; menacing; frightening.
Example: Never turn your back to someone who is displaying threatening behavior.
