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    Online English Dictionary

    Wordnet English Dictionary

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

    Wordnet English Thesaurus

    verb
    certify, guarantee, warrant, protect, secure, guard, safeguard

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