You're under arrest for obstructing justice.

They obstructed our plan.

If you sleep on your back it's easier for your upper airway to be obstructed because your tongue, uvula, etc. slip towards the back of your throat.

The road was obstructed by fallen trees.

Because it inflames upper-airway tissues, smoking often leads to obstructive sleep apnoea. Alcohol and sedatives can worsen apnoea as well; acting as muscle relaxants, they make the airway smaller.

No matter what you desire of life, other people's aims, ambitions and activities constitute vital obstructions along your pathway.

Obstructions near doors can impede people in an emergency.

Necessity gives us obstruction of choice.

A fallen tree obstructed the road.

A large pillar obstructs the view of the lake.