Verbs

(v)guarantee, ensure, insure, assure, securemake certain of“This nest egg will ensure a nice retirement for us”, “Preparation will guarantee success!”
(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”