Слово "obstruction". Англо-русский словарь Мюллера

Mechanics shouted in French; the engine roared, relaxed, roared again; obstructions were pulled away; the plane started.

But my tongue kept getting in the way, like a huge obstruction, and my mouth was dry.

But if there had been no stony obstruction there the labor would have been useless still, for if the beam had been wholly cut away Injun Joe could not have squeezed his body under the door, and he knew it.

Though never permitted by his mother to approach that wall, he had approached the other walls, and encountered hard obstruction on the end of his tender nose.

Now get out of my way, buster, or I'll find some Aurors and have you arrested for obstruction of journalism."

and the biggest obstruction we face in that regard is ruminating.