alert

This signal serves as an alert for medical personnel, immediately drawing attention to potentially hazardous circumstances.

Several users on X, formerly Twitter, posted screenshots of an alert telling them "please check your entries and try again" when attempting to log in.

I was able to sort of stretch so much more because I was kept so alert by the job at hand.

The researchers engineered yeast to act as single-celled drug factories and produce immune checkpoint inhibitors -- anticancer drugs that alert immune cells to the presence of cancer cells.

The UK Health Security Agency also issued the first amber cold weather health alert of the season, warning conditions could be dangerous for elderly and vulnerable people.