stonewall

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

block, blockade, embarrass, hinder, obstruct, stonewaller, stonewalling, stymie, stymy