Revealed or uncovered something that was hidden, or left without protection from something harmful like weather or danger.
From Latin 'exponere' (ex- 'out' + ponere 'to place'), meaning to lay bare or set forth. The meaning evolved from physical exposure to revealing secrets and leaving vulnerable.
The word 'expose' has been used in photography since the 1850s to mean letting light hit film—the same root meaning of 'laying bare' applies whether you're developing a photo or uncovering a scandal.
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