Sentence:  Fortunately , the honor of the denomination can attest that Cyrus Bartol defended Parker 's sincerity , as did also Gannett and Chandler Robbins ; whereupon Parker <WSD>broke</WSD> down into convulsions of weeping and rushed out of the room , though not out of the Fellowship . 
Meaning of the word marked with <WSD> tags:  lose control of one's emotions