assure

Concise Oxford English Dictionary © 2008 Oxford University Press:
assure /əˈʃʊə, əˈʃɔː/

▶verb

• 1 tell someone something positively in order to dispel potential doubts.

• 2 make (something) certain to happen.

• 3 chiefly Brit. cover by assurance.

  ■ secure the future payment of (an amount) with insurance.

– derivatives
assurer noun.

– origin ME: from OFr. assurer, based on L. ad- ‘to’ + securus (see secure).