This is the 4699th most frequent Japanese word.
明ける
"明ける" means "to dawn, to become daylight, or to end/begin (a period of time)."
Here, "明ける" is used to describe the transition from night to day, often implying the break of dawn or morning.
夜が明ける。
The night ends.
In this context, "明ける" refers to the beginning of a new year, symbolizing the transition into a specific period or time frame.
商売繁盛の年が明ける。
The prosperous year for business begins.
"明ける" is utilized here to indicate the end of a season, specifically the rainy season, marking the transition to another season, summer.