Disclose and Mask
Opposite meaning words
Disclose verb - To make known (as information previously kept secret).
Usage example: the informer disclosed all sorts of details about the secret organization
Mask verb - To change the dress or looks of so as to conceal true identity.
Usage example: the federal agents masked their surveillance vehicle so that it looked like an ordinary moving van
Cite this Source
Google Ngram Viewer shows how "disclose" and "mask" have occurred on timeline