wake up

That incident -- followed by a string of unexplained drone flights that rattled other European countries -- served as a wake-up call of the continent's vulnerabilities almost four years after Russia's full-scale invasion of Ukraine.

Chinese hotel offers lion cub wake-up call.

This was a wake-up call to Europe, marking one of the largest and most serious breaches of Nato airspace since the war in Ukraine began.

I was in that mode when I took care of my mother, and it made me realize that the 70% of adults in the U.S. who have no estate plan to speak of needed something of a wake-up call to get them to see how important it is to get your ducks in a row.

In early July, Morgan Stanley received its first wake-up call.