Definitions from Wiktionary (assure)

▸ verb:  (transitive) To make sure and secure; ensure.
▸ verb:  (transitive, followed by that or of) To give (someone) confidence in the trustworthiness of (something).
▸ verb:  (obsolete) To guarantee, promise (to do something).
▸ verb:  (transitive) To reassure.

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