de·clas·si·fy

verb

/diːˈklæsɪfaɪ/

Verb Forms

present simple I / you / we / they declassify	/diːˈklæsɪfaɪ/ /diːˈklæsɪfaɪ/
he / she / it declassifies	/diːˈklæsɪfaɪz/ /diːˈklæsɪfaɪz/
past simple declassified	/diːˈklæsɪfaɪd/ /diːˈklæsɪfaɪd/
past participle declassified	/diːˈklæsɪfaɪd/ /diːˈklæsɪfaɪd/
-ing form declassifying	/diːˈklæsɪfaɪɪŋ/ /diːˈklæsɪfaɪɪŋ/

declassify something to state officially that secret government information is no longer secret将（政府机密文件）解密
- declassified information/documents已解密的情报／文件
opposite classify
Oxford Collocations Dictionary
Declassify is used with these nouns as the object:
document
to change something to a lower classification (2) or to remove it from a list completely将（政府机密文件）解密
- declassify something a proposal to declassify marijuana大麻解密提案
- declassify something as something Wildlife experts will decide next month whether to declassify the bird as a threatened species. 野生动物专家将于下个月决定是否将这种鸟列为受威胁物种。