A person who reveals or makes known something that was previously hidden or secret.
From dis- (meaning to do the opposite) + closer (one who closes), derived from Old French clos meaning 'closed.' The word evolved to mean the opposite of closing: opening up or revealing information.
The prefix 'dis-' is like a linguistic 'undo' button—it flips the meaning of the root word. Discloser is literally someone who un-closes information, which is why whistleblowers and journalists could be called disclosers of hidden truths.
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