Out for the count

I don't understand the meaning of the phrase "out for the count". The whole sentence is "While the Boxer rocket building makes progress, the Hale rocket is out for the count because Jamie's made an error of schoolboy proportions." So if anyone has the idea, pls help me.

It's a boxing term.If one of the two fighters is knocked out/down and can't get up from the floor before the count of ten ends then he's said to be 'out for the count'.
By inference things that over run a schedule and can't be completed on time are also said to be 'out for the count'.