Verbs

(v)guarantee, ensure, insure, assure, securemake certain of“This nest egg will ensure a nice retirement for us”, “Preparation will guarantee success!”
(v)assure, tellinform positively and with certainty and confidence“I tell you that man is a crook!”
(v)assureassure somebody of the truth of something with the intention of giving the listener confidence“I assured him that traveling to Cambodia was safe”
(v)see, check, insure, see to it, ensure, control, ascertain, assurebe careful or certain to do something; make certain of something“He verified that the valves were closed”, “See that the curtains are closed”, “control the quality of the product”
(v)promise, assuremake a promise or commitment