Short for decapitate; to remove the head or top part of something.
From de- (removal) + cap (head, shortened from capital/caput). This is informal, shortened slang used in military, computing, or casual contexts rather than formal language.
Military and tech communities created 'decap' as shorthand for decapitate—showing how specialized groups develop faster language to match the speed of their work, whether dismantling equipment or discussing medieval history.
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