/
əˈʃʊə, 
əˈʃɔː/
v.
   - tell someone something positively in order to dispel potential doubts.
 - make (something) certain to happen.
 - chiefly Brit. cover by assurance. 
▸secure the future payment of (an amount) with insurance.
 
Derivative
Etymology
ME: from OFr. assurer, based on L. ad- ‘to’ + securus (see secure).