Antonyms of verb declassify

1 sense of declassify

Sense 1
declassify -- (lift the restriction on and make available again; "reclassify the documents")
       Antonym of classify (Sense 2)
      => classify -- (declare unavailable, as for security reasons; "Classify these documents")

Synonyms/Hypernyms (Ordered by Estimated Frequency) of verb declassify

1 sense of declassify

Sense 1
declassify -- (lift the restriction on and make available again; "reclassify the documents")
       => free, release -- (make (information) available for publication; "release the list with the names of the prisoners")