demagnetise

Definitions of demagnetise
1

v make nonmagnetic; take away the magnetic properties (of)

Synonyms:
degauss, demagnetize
Antonyms:
magnetise, magnetize
make magnetic
Type of:
alter, change, modify
cause to change; make different; cause a transformation

v erase (a magnetic storage device)

Synonyms:
demagnetize
Type of:
delete, erase
wipe out digitally or magnetically recorded information

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