During the debate, the leader of the opposition challenged the prime minister's economic plan.

When two lines intersect, an opposite angle has the same measure as the angle directly across from it, so knowing one lets you determine the other.

When two lines intersect, the opposite angles are equal, which helps solve many geometry problems.

The council mobilized a counter-opposition to block the reform.

The Opening Opposition drafted a clear strategy to attack the government's case during their second and fourth speeches.

The Closing Opposition delivered a sharp rebuttal in the final round, shifting the judges' attention with strategic contrasts.

At the town meeting, the environmentalists and developers stood firmly on opposite sides of the barricades, each convinced the other threatened the community's future.

The clinic reported an increase in oppositional defiant disorders among adolescents this year.

After repeated incidents at school, his pediatrician diagnosed him with oppositional defiant disorder and recommended behavioral therapy.