Wake-up call

Meaning

An alert that prompts action or change.

Usage

Used when a crisis spurs reflection.

Origin & History

Origins and dates here are approximate summaries. Many idioms have disputed or unknown origins, and not every date has been checked against a historical dictionary, so treat specific dates and stories as a starting point rather than a citation.

Hotels and trains used alarm calls; metaphor applied to sudden warnings.

Grew popular in mid-20th-century business and healthcare contexts.