One of the mysteries of the English language finally explained.
The umbilical cord. In later use frequently in "to bury one's navel-string" and variants (originally and chiefly Caribbean): to feel a strong bond of loyalty or attachment (to a particular place or institution).
Late 16th century; earliest use found in Philip Sidney (1554–1586), author and courtier. From navel + string.
In this article we explore how to impress employers with a spot-on CV.