underwrite

verb8

1. •
   To agree to pay by signing one's name; subscribe.
2. •
   Specifically, to assume financial responsibility for something, and guarantee it against failure.
3. •
   To act as an underwriter.

   • The broker who procures the insurance […]ought not, by underwriting the policy, to deprive the parties of his unbiased testimony. — 1810
4. •
   To support, lend support to, guarantee the basis of.
5. •
   To write below or under; subscribe.
6. •
   To sign; to put one's name to.
7. •
   (no longer used) To subscribe (a document, policy etc.) with one's name.
8. •
   (no longer used) To submit to; put up with.