noun
one color; single color
Often used after a color word, as in 白一色 or 黒一色, to say that something is entirely that one color.
会場の飾りは白一色で統一されていた。
The decorations at the venue were unified in all white.
画面が突然
The screen suddenly turned entirely blue.
noun
all one kind; dominated by one thing; filled with one mood or topic
Extends from 'one color' to situations where a place, selection, conversation, or atmosphere is overwhelmingly one type, tendency, topic, or mood. Common in patterns like クリスマス一色, 選挙一色, and 祝賀ムード一色.
棚は輸入ワイン一色だった。
The shelves were filled entirely with imported wine.
街はクリスマス一色だ。
The town is completely in the Christmas spirit.
ニュースは選挙一色になった。
The news became dominated entirely by the election.