Underwrite (verb)

1. To guarantee financial support or sponsorship for (something).
2. To sign as a guarantee of payment or fulfillment of obligation.
3. To write or inscribe something beneath or underneath.

Origin:

Late 16th century, from under- "below" + write.

Examples:

1. The bank will underwrite the loan for the new factory.
2. The policy was underwritten by the insurance company.
3. She underwrote her name on the bottom of the page.
4. The company decided to underwrite the cost of the project.
5. The bank has agreed to underwrite the bonds issued by the corporation.