To block up; to stop up or close, as a way or passage; to place an obstacle in, or fill with obstacles or impediments that prevent or hinder passing; as, to obstruct a street; to obstruct the channels of the body.

To be, or come, in the way of; to hinder from passing; to stop; to impede; to retard; as, the bar in the harbor obstructs the passage of ships; clouds obstruct the light of the sun; unwise rules obstruct legislation.

hinder or prevent the progress or accomplishment of; "His brother blocked him at every turn"

when a piece moves in front of an enemy Pawn it obstructs its advance (see blockade) example

obtain occupy