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Synonyms
en·sure (ĕn-shŏŏŕ)

[Middle English ensuren, from Anglo-Norman enseurer, Old French en-, causative pref.; see en–1, + Old French seur, secure variant of sur; see sure.]

transitive verb: -sured, -sur·ing, -sures. 

To make sure or certain; insure: Our precautions ensured our safety. See Usage Note at: assure