One that opposes another in a battle, contest, controversy, or debate: adversary, antagonist, opponent, opposition, oppositionist, resister.

What does opposer mean?

Definitions of opposer. someone who offers opposition. synonyms: adversary, antagonist, opponent, resister. Antonyms: agonist. someone involved in a contest or battle (as in an agon)

What does it mean to uphold something?

English Language Learners Definition of uphold

: to support or defend (something, such as a law) : to judge (a legal decision) to be correct : to decide not to change (a verdict)