knock_down
1. [ verb ] cause to come or go down
Synonyms: cut_down push_down pull_down down
Examples:

"The policeman downed the heavily armed suspect" "The mugger knocked down the old lady after she refused to hand over her wallet"

Related terms: strike submarine sedative
2. [ verb ] knock down with force
Synonyms: coldcock dump floor deck
Examples:

"He decked his opponent"

Related terms: beat floor
Similar spelling:   knockdown
  knock-down
  knocked_out
  knockout
  knock_out