1. a person whose business is buying old or injured horses and slaughtering them
Usage: British
2. a person who buys old buildings, ships, or machinery to break them up for scrap
Usage: British

1. to exhaust or wear out completely
Usage: British; informal

Examples

• The old racehorse was sold to the knacker when it could no longer compete.
• The knacker’s yard was where unwanted horses met their end.
• They called in a knacker to demolish the old factory building.
• The ship was sold to a knacker for scrap metal.
• That long hike really knackered me.
• I’m absolutely knackered after working all day.
• The intense training session knackered the entire team.