The Hebrew word Orewa - Raven, has another value - the Guarantor, the Guarantor. What is the affinity of these words?

The Hebrew word Orewa - Raven, has another value - the Guarantor, the Guarantor. What is the affinity of these words?

How is black raven, and "is black" person requiring the guarantee (compensation) for their services.

(From the book Schlawe Sulyam. SLAVE "W).