A countdown is the act of counting backward to zero to mark the time remaining before something important happens, like a launch or start.
Formed in English from “count” and “down,” it became common with rocket launches and timed events in the 20th century. The word captures both the numbers and the rising tension.
A countdown is like a shared drumbeat that gets everyone’s attention synchronized on one moment. That’s why it’s used for rockets, New Year’s, and even game shows—numbers falling create rising excitement.
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