A contract by which that which was Infirm, imperfect, or subject to be avoided Is made firm and unavoidable. A conveyance of an estate or right in esse, whereby a voidable estate is made sure and unavoidable, or whereby a particular estate is increased. Co. Litt. 2956. Jackson v. Itoot, 18 Johns. (N. Y.) 00; People v. Law, 34 Barb. (N. Y.) 511; De Mares v. Gilpin, 15 Colo. 70, 24 Pac. 508.