stonewall

Verb
  1. Obstruct or hinder any discussion (synset 201036804)
    "Nixon stonewalled the Watergate investigation"; "When she doesn't like to face a problem, she simply stonewalls"
  2. Engage in delaying tactics or refuse to cooperate (synset 200461087)
    "The President stonewalled when he realized the plot was being uncovered by a journalist"

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