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[C or U] something that blocks a road, passage, entrance, etc. so that nothing can go along it, or the act of blocking something in this wayThere's some sort of obstruction on the railway tracks.
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[U] behaviour or actions that prevent something from happening or working correctlyThey were charged with obstruction of the police/of justice (= preventing the police/law courts from doing their jobs).
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[U] in sport, when one player gets in the way of another and so prevents them from moving freelyThe referee said it was obstruction.