Topic: SPORT
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ob‧struc‧tion

1 [uncountable and countable] when something blocks a road, passage, tube etc, or the thing that blocks it [= blockage]:
an operation to remove an obstruction from her throat
an operation to remove an obstruction from her throat2 [uncountable] when someone or something prevents or delays a legal or political process
obstruction of
the obstruction of vital legislation
the obstruction of vital legislation3DS [uncountable] an offence in football, hockey etc in which a player gets between an opponent and the ball