Idiom Definition:
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"to keep someone  (or something) in the dark"  
    to purposefully not tell something to someone (or something)
     
Synonyms:
blind, deceive, misinform, double-talk, doublespeak,  ignorant,  mindless, misdirect, misguide, misinformed, mislead, misstate, naive, oblivious, prevaricate, unaware, unconscious, unconversant, unenlightened, uninformed, unknowing, unsuspecting, unwitting, witless
 
 
Let's 
keep this man in the dark? - - - - ->  
