To sign back; to return by a formal act; to yield to another; to surrender; -- said especially of office or emolument. Hence, to give up; to yield; to submit; -- said of the wishes or will, or of something valued; -- also often used reflexively.
I have never been a quitter. To leave office before my term is completed is opposed to every instinct in my body. But as president I must put the interests of America first Therefore, I shall resign the presidency effective at noon tomorrow. Richard M. Nixon