After graduation, he gradually cut the umbilical cord to his parents and started to earn his own living.

umbilical cord 由 umbilical（脐带的）和 cord（绳索）组成。umbilical 来自拉丁语 umbilicus（肚脐），指与脐带相关的。 cord 指"绳索、带子"，特指连接母体和胎儿的生理结构。 umbilical cord 本义是"脐带"，这里用作比喻，表示"依赖关系"或"情感纽带"。