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getting in someone's way
the act of obstructing; "obstruction of justice"
any structure that makes progress difficult
something immaterial that stands in the way and must be circumvented or surmounted; "lack of imagination is an obstacle to one's advancement"; "the poverty of a district is an obstacle to good education"; "the filibuster was a major obstruction to the success of their plan"
the physical condition of blocking or filling a passage with an obstruction