Meaning

verb make known to the public information that was previously known only to a few people or that was meant to be kept a secret

verb disclose to view as by removing a cover

originFrom Middle English disclosen, from Middle French desclos, from Old French desclore, itself from Vulgar Latin disclaudere, from Latin dis- + claudere (“to close, shut”) or as a variant of discludo, discludere (cf. disclude). By surface analysis, dis- + close.

Etymology from Wiktionary, CC BY-SA 3.0