guarantee

Universal Words noun, verb noun 1 a firm promise that you will do sth or that sth will happen: to give a guarantee of good behaviour * He gave me a guarantee that it would never happen again. * They are demanding certain guarantees before they sign the treaty. 2 a written promise given by a company that sth you buy will be replaced or repaired without payment if it goes wrong within a particular period: We provide a 5-year guarantee against rust. * The watch is still under guarantee. * The television comes with a year's guarantee. * a money-back guarantee 3 ~ (of sth)