1) Bar 2) Barricado 3) Block 4) Clog 5) Congest 6) Dam 7) Damup 8) Forestall 9) Frustrate 10) Hinder 11) Impede 12) Jamup 13) Obturate 14) Occlude 15) Oppilate 16) Oppose 17) Prevent 18) Stonewall 19) Stop 20) Stuff 21) Stymie 22) Stymy 1) Block 2) Block from stone wall 3) Block passage through 4) Blockade 5) Contributors dismiss iron bar 6) Delay 7) Embarrass 8) Encumber 9) Forbid 10) Foreclose 11) Forestall 12) Get in the way of 13) Hamper 14) Hinder 15) Hold back 16) Hold up 17) Inhibit 18) Preclude 19) Prevent 20) Slow down 21) Stymie 
• (v. t.) 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. • (v. t.) To block up; to stop up or close, as a way or passage; to place an obstacle in, or fill with obstacles ...
Ob·struct' transitive verb [ imperfect & past participle Obstructed ; present participle & verbal noun Obstructing .] [ Latin obstructus , past participle of obstruere to build up before or against, to obstruct; ob ...
[v] - hinder or prevent the progress or accomplishment of 2. [v] - block passage through
obstruct 1. To block or fill (a passage) with obstacles or an obstacle. 2. To impede, retard, or interfere with; to hinder. 3. To get in the way of so as to hide from sight.
verb shut out from view or get in the way so as to hide from sight; `The thick curtain blocked the action on the stage`; `The trees obstruct my view of the mountains`
[SAT terms] block passage through block passage through[ACT vocabulary] block passage through