#1 guarantee v. [vouch] give surety or assume responsibility; "I vouch for the quality of my products". wn
#2 guarantee n. [warrant, warrantee, warranty] a written assurance that some product or service will be provided or will meet certain specifications. wn
#3 guarantee v. [ensure, insure, assure, secure] make certain of; "This nest egg will ensure a nice retirement for us"; "Preparation will guarantee success!". wn
#4 guarantee v. [undertake] promise to do or accomplish; "guarantee to free the prisoners". wn
#5 guarantee n. an unconditional commitment that something will happen or that something is true; "there is no guarantee that they are not lying". wn
vizzz