The Oxford Thesaurus An A-Z Dictionary of Synonyms - underwritev.

1) back (up) , finance, support, invest in, subsidize, subvene, sponsor, uphold, approve, insure, guarantee, US subvene: The company has agreed to underwrite the development of your invention. 2) subscribe to, endorse or indorse, sign, countersign, consent to, agree to, confirm, accede to, sanction, ratify, approve, validate, Colloq OK or okay: The government underwrote the action one day, then denied knowledge of it the next.