Sentence:  The foregoing , aided by several clues I 'll <WSD>withhold</WSD> to keep you on your toes , will pursue you with a tenacity worthy of Inspector Javert , but before they close in , gird yourselves , I repeat , for a vengeance infinitely more pitiless . 
Meaning of the word marked with <WSD> tags:  hold back; refuse to hand over or share