最さい大だい野や党とう

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Meanings

1

noun

main opposition party; largest opposition party

Refers to the largest political party not in government, typically in a parliamentary system.

utmost, most, extreme

大large, big

野plains, field, rustic

党party, faction, clique

与よ党とう
与党 means 'ruling party' or 'government party', the opposite of 野党.
野や党とう
野党 is a general term for 'opposition party'; 最大野党 specifies the largest one.

Compound of 最大 (largest) and 野党 (opposition party).