Sentence:  Kerviel's identity was revealed on the "Financial Times" and "Daily Telegraph" websites, but was not confirmed by bank officials, who admitted on Thursday that the rogue trader appeared to have <WSD>gone to ground</WSD> and that they had no idea where he was. 
Meaning of the word marked with <WSD> tags:  To hide from public view or sequester oneself, especially when authorities, members of the news media, or others are looking for one.