This is the 7994th most frequent Japanese word.
天下
"天下" (tenka) means "the world" or "the realm," often implying dominion or everything under heaven.
Here, "天下" denotes 'the world' within the context of Go, suggesting he is the best player globally or among experts.
彼は囲碁の天下一だ。
He is the number one in the world of Go (board game).
In this sentence, "天下" is used to represent 'the world' or 'the realm', indicating the goal or ambition of unifying a large domain.
天下を統一することを夢見た。
They dreamed of unifying the world.
In this sentence, "天下" is employed to mean 'the sky' or 'the weather conditions', showcasing its more poetic or atmospheric usage.