Chilling means making someone feel frightened or deeply uneasy, like a cold shiver running down their spine. A chilling story might keep you awake at night, thinking about creaky floorboards or shadows in the hallway. When someone describes a movie scene as chilling, they mean it created genuine fear or dread that lingers.

The word works because fear can literally make you feel cold. Your body temperature drops slightly when you're scared, and you might actually shiver. So when something is chilling, it affects you like a sudden blast of icy wind, but the cold comes from inside your own reaction to what's happening.

You might read a chilling account of a shipwreck in a history book, or hear a chilling howl in the woods at night. Sometimes people describe real events as chilling when they reveal something disturbing about human behavior, like a chilling confession or a chilling lack of concern for others' safety. The word suggests that whatever happened went beyond ordinary bad or sad and reached something that unsettles us at a deeper level.

Chilling can also mean relaxing or hanging out casually, as in “just chilling with friends,” but that's a completely different and much more recent slang usage.