Synonyms for ensure

Verb

1. guarantee, ensure, insure, assure, secure

usage: make certain of; "This nest egg will ensure a nice retirement for us"; "Preparation will guarantee success!"

2. see, check, insure, see to it, ensure, control, ascertain, assure, verify

usage: be 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"