be behind; approve of; "He plumped for the Labor Party"; "I backed Kennedy in 1960"
To give one's name or support to; to sanction; to aid by approval; to approve; as, to indorse an opinion
To write one's name, alone or with other words, upon the back of (a paper), for the purpose of transferring it, or to secure the payment of a note, draft, or the like; to guarantee the payment, fulfillment, performance, or validity of, or to certify something upon the back of (a check, draft, writ, warrant of arrest, etc