The answer to the idiom is that each wave is higher than the other.

Explanation: servant: fall; G: then, keep up. The front fell, and the back also fell. Describe a heroic struggle.

From: Tang Sun Qiao's "Sacrifice to Zitong Shen Jun": "The lame horse is a servant, and the former servant is a servant."

Example: ~ people should have it, for example, you deserve XuanYuanYang!

◎ Qing Qiu Jin's "The Martyr of Hanging Arms"

Grammar: combination; As predicate, attribute and adverbial; With praise.