The Collaborative International Dictionary of English v.0.48:
Obstruct \Ob*struct"\, v. t. [imp. & p. p. Obstructed; p. pr.
& vb. n. Obstructing.] [L. obstructus, p. p. of obstruere
to build up before or against, to obstruct; ob (see Ob-) +
struere to pile up. See Structure.]
1. 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.
'T is the obstructed paths of sound shall clear.
2. 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. "Th'
impatience of obstructed love." --Johnson.
Syn: To bar; barricade; stop; arrest; check; interrupt; clog;
choke; impede; retard; embarrass; oppose.