Definitions from Wiktionary (knock down)

▸ verb:  To hit or collide with
▸ verb:  (transitive) To hit or knock (something or someone), intentionally or accidentally, so that it falls.
▸ verb:  (transitive) To demolish.
▸ verb:  (transitive, informal) To reduce the price of.
▸ verb:  (transitive, usually passive voice) To disassemble for shipment.
▸ verb:  To acquire money, especially illicitly
▸ verb:  (transitive) To accumulate money, usually through crime.
▸ verb:  (transitive) To embezzle.
▸ verb:  To drink or party
▸ verb:  (transitive, informal) To drink fast.
▸ verb:  (transitive, slang, Australia) To spend extravagantly for a celebration.
▸ verb:  To choose, declare or approve.
▸ verb:  (transitive) To approve a drinking toast by banging glasses on the table.
▸ verb:  (transitive, archaic) To nominate (someone) to speak.
▸ verb:  (transitive, Australia, New Zealand) To introduce (someone) to another, especially to a woman.
▸ verb:  (transitive) To reject or override a decision.
▸ verb:  (transitive) To sentence (someone) to prison or other sentence.
▸ verb:  (transitive) At an auction, to declare (something) sold with a blow from the gavel.
▸ verb:  (dated, rail transport) To send a stop signal to ensure a train is signalled to stop at the correct point.
▸ verb:  (transitive, firefighting) To reduce the burning of (a fire), as by cooling it with water or dirt.

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