Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun count_down

1 sense of countdown

Sense 1
countdown -- (counting backward from an arbitrary number to indicate the time remaining before some event (such as launching a space vehicle))
       => count, counting, numeration, enumeration, reckoning, tally -- (the act of counting; reciting numbers in ascending order; "the counting continued for several hours")

Synonyms/Hypernyms (Ordered by Estimated Frequency) of verb count_down

1 sense of count down

Sense 1
count down -- (count backwards; before detonating a bomb, for example)
       => count -- (name or recite the numbers in ascending order; "The toddler could count to 100")