Knock out

1. to strike or bump someone or something out

   I accidentally knocked out the glass in my picture frame.

2. to render someone unconscious, as by a blow to the head

   The boxer knocked out his opponent in the third round.

3. to put someone to sleep

   The allergy pill knocked him out for a good three hours.

4. to complete, especially in haste

   They knocked out the entire project in one night.