down for the count

adjective2

1. •
   Decisively beaten; defeated; rendered irrelevant for the long term.

   • As the company grew, one after another of its smaller competitors ended up down for the count.
2. •
   (figurative) Soundly unconscious, either because asleep or because otherwise knocked out.

   • A: Look at him, he's out like a light! B: Yeah, he had a long day! And now he's down for the count.