What does “a wake-up call” mean in English?

A wake-up call can be literal — a hotel worker phones your room to wake you up. But most of the time the phrase means something else: a scary or shocking event that makes people realize they need to change before something worse happens. You hear it in news reports, at work, and in everyday talk. The event itself is the warning.

In the clip, a reporter covering two pedestrian deaths in Memphis says the community hopes “these incidents serve as a wake up call for both drivers and walkers.” The crashes are not a phone call — they are a warning. Two people died, and now everyone needs to pay more attention. You hear the same idea in many situations: “The heart attack was a wake-up call — he stopped smoking the next day.” Or: “Losing the big client was a wake-up call for the whole team.” It works in news, at a doctor’s office, or in everyday conversation. The tone is serious — something bad happened, and now people must act.