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1. Oxford American Dictionary

   knock out

   • ph.
     make a person unconscious, typically with a blow to the head；knock down a boxer for a count of ten, thereby winning the contest
2. • 釋義

   ph.

   片語

   • 1. make a person unconscious, typically with a blow to the head
   • 2. knock down a boxer for a count of ten, thereby winning the contest
   • 3. work so hard that one is exhausted
   • 4. astonish or greatly impress someone
   • 5. defeat a competitor in a knockout competition
   • 6. destroy, damage, or disable a machine or piece of equipment
   • 7. produce work at a steady fast rate
   • 8. empty a tobacco pipe by tapping it against a surface