Sentence:  The solitary, lumbering trolls of Scandinavian mythology would sometimes be turned to stone by exposure to sunlight. Barack Obama is hoping that several measures <WSD>announced</WSD> on June 4th will have a similarly paralysing effect on their modern incarnation, the patent troll. 
Meaning of the word marked with <WSD> tags:  to give public notice, especially for the first time; to make known