Princeton's WordNet

1. knock-down(a), powerful(verb)

   strong enough to knock down or overwhelm

   "a knock-down blow"

2. down, knock down, cut down, push down, pull down(verb)

   cause to come or go down

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

3. deck, coldcock, dump, knock down, floor(verb)

   knock down with force

   "He decked his opponent"

4. blast, knock down(verb)

   shatter as if by explosion

Kernerman English Learner's Dictionary

1. knock down(verb)ˈɑɑk

   to demolish a building

   They're knocking down the houses to make way for a new shopping mall.

2. knock downˈɑɑk

   to hit sb with a vehicle, causing them to fall

   She was knocked down by a bus.

Wiktionary

1. knock down(Verb)

   To hit or knock (something), intentionally or accidentally, so that it falls

2. knock down(Verb)

   To demolish.

3. knock down(Verb)

   At an auction, to declare (something) sold with a blow from the gavel.

4. knock down(Verb)

   To reduce the price of.

5. knock down(Verb)

   To drink fast

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