Countdown vs. Count Down
“Countdown” is the closed noun for the act of counting backward or a lead-up period. “Count down” is the two-word phrasal verb for performing that count.
Use “countdown” as the noun for counting backward or the period leading to an event. Use “count down” as the verb meaning to count backward toward zero.
Key details
Choose the right form
| Meaning / situation | Form / construction | Decision |
|---|---|---|
| a noun names the backward count or lead-up period | countdown | Use the closed noun. |
| a verb describes counting backward | count down | Use the two-word phrasal verb. |
| the words take tense or verbal inflection | count down / counted down / counting down | Treat the expression as a verb phrase. |
Quick tests
Meaning / construction test
Is the expression functioning as a verb that can change tense?
If yes: Use “count down.”
If no: If it names the event or period, use “countdown.”
Caveat: Choose by the documented meaning or construction; a different pattern may be valid in a different sentence structure or variety.
Examples
The countdown begins at noon.
The word names the lead-up event.
We will count down from ten.
The words form the phrasal verb.
They counted down the final seconds.
Past-tense inflection confirms the verb phrase.
Further guidance
Core difference
Use the documented noun or modifier form when naming a thing, result, event, or concept; use the spaced form when the words function as a verb.
Fast Test
If the expression can take ordinary verb tense or inflection in the sentence, the spaced verb form is usually the relevant choice.
Variant Boundary
Cambridge distinguishes the closed noun “countdown” from the two-word phrasal verb “count down.”
Sources and evidence
Sources are shown with the role they play in this guide. Historical or style-sensitive claims are kept within the evidence boundary described above.
- Countdown — Cambridge Dictionary (opens in a new tab)Cambridge Dictionary · Closed noun “countdown” for counting backward or a period leading to an event
- Count down — Cambridge Dictionary (opens in a new tab)Cambridge Dictionary · Two-word phrasal verb “count down” for counting backward toward zero