IdiomDaily LifeEnglish

dyed in the wool

Meaning: Having a trait that is thoroughly ingrained or basic to one's nature.

Example: “My grandfather is a dyed-in-the-wool Red Sox fan.”

Origin: A real textile distinction: dyeing raw wool fiber before it's ever spun into yarn produces color that penetrates all the way through and resists fading, unlike dye applied afterward to finished cloth, which sits closer to the surface and wears off faster. Richard Hooker's 1597 Of the Lawes of Ecclesiasticall Politie carries the earliest documented figurative use, and 16th-century English writers extended the comparison to describe how thoroughly a belief or character trait instilled early in life — like color set into raw wool — tends to last a person's whole life, resistant to any later change.

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