IdiomBody & SensesSpanish

Ser uña y carne

Meaning: To be inseparable; the closest of friends.

Literally: To be fingernail and flesh

Example: “Esas dos vecinas son uña y carne desde el colegio.” — Those two neighbors have been thick as thieves since school.

English equivalent: Thick as thieves

Origin: The nail and the flesh under it are so tightly joined that pulling them apart hurts. Two people who are uña y carne are inseparable friends; the RAE dictionary lists ser uña y carne dos o más personas. It has no particular story behind it.

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