Sentence:  The Washington state supreme court ruled that the state 's occupation tax applied to sales , made at cost to an oil company , by a wholly-owned subsidiary set up to purchase certain supplies without <WSD>divulging</WSD> the identity of the parent . 
Meaning of the word marked with <WSD> tags:  make known to the public information that was previously known only to a few people or that was meant to be kept a secret