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"

1. A fence built of rough stones; used to separate fields
   "The old stone wall marked the boundary between the two farms"

Derived forms: stonewalled, stone walls, stonewalling, stonewalls

Type of: block, blockade, delay, detain, embarrass [archaic], fence, fencing, hinder, hold up, obstruct, stymie, stymy [rare]

Encyclopedia: Stonewall, OK