烏兎匆匆
Meanings
1
time flies; days and nights pass quickly
A yojijukugo (four-character idiom) of Chinese origin. 烏 (crow) represents the sun, and 兎 (rabbit) represents the moon; together they evoke the swift passage of days and nights. Used in literary or formal contexts to express how time flies.
Time flies; before I knew it, it's already the end of the year.
The phrase 'uto sōsō' expresses how quickly the days and months pass.