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to block a road, passage, entrance, etc. so that nothing can go along it, or to prevent something from happening correctly by putting difficulties in its wayAfter the earthquake many roads were obstructed by collapsed buildings.
Her view of the stage was obstructed by a pillar.
An accident is obstructing traffic on the M11.
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to try to stop something from happening or developingto obstruct a police investigation
He got five years in prison for withholding evidence and obstructing the course of justice.