1. people who buy old or injured horses for slaughter
Usage: British
2. people who buy and dismantle old buildings or machinery for salvage
Usage: British

Examples

• The old racehorse was sold to the knackers when it could no longer compete.
• Local knackers demolished the abandoned factory to sell the scrap metal.
• The farmer called the knackers to remove his injured livestock.
• Knackers often salvage valuable materials from old buildings.
• The knackers’ yard was filled with discarded machinery and vehicle parts.