count down
verb
Definitions
To announce the passage of time to a precisely timed expected event.
Example: The sound system counted down the seconds to meteor impact.
To await a precisely timed expected event.
Example: The party was counting down the days to Inauguration.
noun
Definitions
A count backward in fixed units to the time of some event, especially the launch of a space vehicle.
The acts of preparation carried out during this period.
A radio or television program counting down the top songs of a given week, usually in reverse order ending with the No. 1.