verb (v)

• hinder or prevent the progress or accomplishment of(verb.social)

  Synonym:
  block, blockade, embarrass, hinder, stymie, stymy
  

  source: wordnet30
• block passage through(verb.contact)

  Example:
  Obstruct the path.
  

  Synonym:
  block, close up, impede, jam, obturate, occlude
  Antonym:
  disengage, free
  

  source: wordnet30
• shut out from view or get in the way so as to hide from sight(verb.perception)

  Example:
  The trees obstruct my view of the mountains.
  

  Synonym:
  block
  

  source: wordnet30
• 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.(verb)

  source: webster1913