Literature Reference: Strength is worn away, and real achievements are but empty. Source from 'Wei Zhi Jiu Bai Shang Shu Ju Yi Xu Chu Xing Bu Yin Shu He Yi Jian Yong Li Huai'.
销:
Expenses
磨: Tempering. Honing.
Meaning: Xiao Mo implies the gradual wear of strength, the passage of time, and the fading of things.