assure/ə'∫ʊər $ ə'∫ʊr/

a.

➊ tell sb sth in order to take away any doubts they have

➋ make sth certain to happen or to be achieved

v.

➊ 向…保证；使确信，使放心：[assure sb (that) ...] The doctor assured me that the operation would not hurt. 医生让我放心，手术不会痛。

➋ 确保：His wealth of experience has assured his success. 他丰富的经验确保了他胜券在握。

构词as (= ad-) + sure

同根 assure; insure; sure