knacker

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Definitions from WordNet

Noun knacker has 2 senses

knacker - someone who buys old buildings or ships and breaks them up to recover the materials in them
--₁ is a kind of wrecker
knacker - someone who buys up old horses for slaughter
--₂ is a kind of butcher, slaughterer

Definitions from the Web

Knacker

Noun (Person)

Definition: A person whose occupation is the disposal of dead or worn-out horses, typically by rendering their flesh for use in products such as pet food and glue.

Example sentence: The knacker arrived to collect the deceased racehorse from the track.

Verb

Definition: To slaughter or convert into animal feed or other products.

Example sentence: He decided to knacker the old cow that was causing too much trouble in the herd.

Noun (Slang)

Definition: (British slang) A person in a state of exhaustion or extreme tiredness.

Example sentence: After running a marathon, I felt like a total knacker, unable to move my legs.