Countdown and Running start

Countdown noun - Counting backward from an arbitrary number to indicate the time remaining before some event (such as launching a space vehicle).

Running start and countdown are semantically related In some cases you can use "Running start" instead a noun "Countdown".

Nearby Words: count, counting

Running start noun - A racing start in which the contestants are already in full motion when they pass the starting line.

Countdown and running start are semantically related in beginning topic. Sometimes you can use "Countdown" instead a noun phrase "Running start".