the opposition party (a political party not in power, opposing the ruling party).
野党は政府の政策に反対している。
The opposition party is opposing the government's policies.
次の選挙で野党が巻き返すか注目されている。
It's being watched whether the opposition party will make a comeback in the next election.
与党と野党の議論がテレビで放映された。
Debates between the ruling party and the opposition were broadcast on TV.