1. to remove magnetic properties from something; to cause something to lose its magnetism
Usage: British spelling; American English typically uses 'demagnetize'; transitive verb

Examples

• The technician used a demagnetising coil to demagnetise the metal parts.
• Exposure to high heat can demagnetise a compass needle.
• We need to demagnetise these tools before storing them.
• The strong electromagnetic pulse demagnetised all the nearby electronic devices.
• Demagnetising the old hard drive ensured the data could not be recovered.