split-second

split-second (plural split-seconds)

1. The nick of time; a brief moment.
   • 2021 September 15, Laura Martin, “How talent shows became TV's most bizarre programmes”, in BBC‎:

     It appears Cowell has been taking notes from South Korea, as his next talent show Walk The Line, coming later this year, has also been game-ified: it will see singers perform, then have to make the split-second decision of whether to take a cash prize or risk advancing in the competition instead.