Countdown

Alternative forms

• count down
• count-down

Origin

count + down

Full definition of countdown

Noun

1. A count backward in fixed units to the time of some event, especially the launch of a space vehicle
2. The acts of preparation carried out during this period
3. (slang) A radio or television program counting down the top songs of a given week, usually in reverse order ending with the No. 1.

Verb

verb

1. (nonstandard) To count down