Sentence:  Gun set the captain 's fifth of Hiram Walker inside the safe before he reported to Lt. Killpath , though he knew that Killpath 's ulcer <WSD>prevented</WSD> him from making any untoward incursion on Herman Wolff 's gift . 
Meaning of the word marked with <WSD> tags:  stop (someone or something) from doing something or being in a certain state