"ensure" in the verb sense
1. guarantee, ensure, insure, assure, secure
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
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"
Source: WordNet® (An amazing lexical database of English)
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