天馬行空

Sky or heaven; the universe; day or a period of time; nature; weather; season.

A horse; a knight in chess; a surname; a counting tool; a radical in Chinese chess.

To walk, go, travel, move; to do, perform, capable; behavior, conduct; a line, row; a trade, profession; a business firm; a measure word for rows or lines.

empty; vacant; unoccupied; air; sky; space; in vain; to empty; leisure; free time; bare; deserted; vast; high