Meanings of obstructor in English

From what I can learn, North has been an obstructor, all along, hasn't he?

This motion was plausible, and this time the obstructor spoke plausibly, concealing the temper which really pervaded his opposition.

The great obstructor of the Queen's bounty was removed, and Spenser might hope that now, at last, the hour of his prosperity was come.

So saying they turned to the right and prepared to scout round the rock and continue their way; but this did not suit their obstructor.

On this the cure agreed to marry the young couple next day at ten: and the professional obstructor of bliss went home with Gerard's angel.

Adair's prophecy that President Colbrith would prove himself an obstructor of the stubbornest was amply fulfilled during the short interval which remained for decisive action.

Obstruction to the truth recoils upon the obstructors.

There are half-a-dozen obstructors, all faddists, but Henslow, with a real case behind him, is sitting tight.

Teddy rushed through the crowd, pushing obstructors aside, and hurled himself through the window into the burning car.

Once let insight into yourself, your weakness and your real motives creep into your mind and your hate against opponents and obstructors must lessen.