Sentence:  A nuclear pacifier of these dimensions - roughly some six and a half times bigger than anything the United States has <WSD>triggered</WSD> experimentally - would certainly produce a bigger bang , and , just for kicks , Khrushchev might use it to propel the seminar of the house of delegates from St. Louis to the moon , where there would n't even be any beer to drink . 
Meaning of the word marked with <WSD> tags:  release or pull the trigger on