to distort or confuse (a message), giving a false impression of the facts
garbler noun
Middle English garbelen to sift, select, via Old Italian and Arabic from late Latin cribellum, dimin. of Latin cribum sieve. The current meaning of garble, which suggests mixing things together confusedly, seems to be at odds with its etymology. The notion originally underlying the metaphorical sense was, however, that of distorting the facts by deliberately selecting those that supported one's case and screening out those that were disadvantageous