Stonewall
WordNet
verb
(1) Engage in delaying tactics or refuse to cooperate
"The President stonewalled when he realized the plot was being uncovered by a journalist"
(2) Obstruct or hinder any discussion
"Nixon stonewalled the Watergate investigation"
"When she doesn't like to face a problem, she simply stonewalls"
WiktionaryText
Verb
- To refuse to cooperate, especially in supplying information.
- At the press conference, the Prime Minister appeared to be stonewalling when asked about tax increases.