underwrite

v. t. [ imp. Underwrote Obs. Underwrit p. p. Underwritten Obs. Underwrit; p. pr. & vb. n. Underwriting. ] 1. To write under something else; to subscribe. [ 1913 Webster ]

What addition and change I have made I have here underwritten. Bp. Sanderson. [ 1913 Webster ]

2. To subscribe one's name to for insurance, especially for marine insurance; to write one's name under, or set one's name to, as a policy of insurance, for the purpose of becoming answerable for loss or damage, on consideration of receiving a certain premium per cent; as, individuals, as well as companies, may underwrite policies of insurance. B. Jonson. [ 1913 Webster ]

The broker who procures the insurance ought not, by underwriting the policy, to deprive the parties of his unbiased testimony. Marshall. [ 1913 Webster ]