Variant spelling of defuse; to remove a fuze (military spelling) from an explosive, or to reduce tension in a situation.
From 'de-' plus 'fuze,' the military spelling of fuse. The military uses 'fuze' to distinguish the ignition device from the electrical 'fuse,' creating a specialized vocabulary.
Military English created 'fuze' as a distinct spelling to avoid confusion with electrical fuses—a small spelling difference that shows how specialized technical communities develop their own vocabulary for precision.
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