noun which may take the genitive case particle 'no', adverb taking the 'to' particle
very big; very large; huge
Emphasizes that something is extremely large in size, scale, or extent. Often used attributively with の or adverbially with と.
大々的なキャンペーンを展開した。
They launched a very large-scale campaign.
そのニュースは大々と報じられた。
The news was reported in a big way.
adverb taking the 'to' particle
taking up a lot of space; bulky; sprawling
Describes something physically occupying a large area or being spread out. Often used with と to describe a state or manner.
荷物が大々と置かれていて、部屋が狭く感じる。
The luggage is placed taking up a lot of space, making the room feel cramped.
Reduplication of 大 (だい, 'big') for emphasis. The exact historical derivation is uncertain, but it follows a common pattern of repeating a character to intensify meaning.