Advice to beware, as of a person or thing
An instance that warns or discourages prospective imitators
A signal that warns of imminent danger
"I'm warning you," she said again, backing away.
Len shot Howard a warning look.
He bent down his head and listened, shaking a warning finger at his master.
Her eyes burned in warning and she looked away.
You're going to ignore my warning, aren't you?