From Longman Dictionary of Contemporary Englishassureas‧sure /əˈʃʊə $ əˈʃʊr/ ●●○ W3 AWL verb [transitive] 1 PROMISEto tell someone that something will definitely happen or is definitely true so that they are less worried SYN reassureassure somebody that Her doctor has assured us that she’ll be fine. The document is genuine, I can assure you.assure somebody of something The dealer had assured me of its quality. → rest assured at rest2(5)► see thesaurus at promise2 CERTAINLY/DEFINITELYto make something certain to happen or to be achieved SYN ensure Excellent reviews have assured the film’s success.assure somebody (of) something A win on Saturday will assure them of promotion to Division One.3 → assure yourself4 → the sum assuredGRAMMAR: Comparisonassure• You assure someone that something is true or will happen: He assured them that they would be safe.• You assure someone of something: He assured them of their safety.guarantee• You guarantee that something is true or will happen: We guarantee that you will get your money back.• You guarantee to do something: We guarantee to give you your money back.• You guarantee someone something: We guarantee you a full refund.→ See Verb table
Examples from the Corpus
assure• The new contract means that the future of the company is assured.• Its mere arrival on the scene will not assure a revolution in education or in politics.• It is said that pregnant women were assured a smooth delivery when they drank from his cup, hence his patronage.• The doctor assured me that I wouldn't feel any pain.• Tribal groups do that, using clans and other extended-family groupings to assure that everyone has a place at the social table.• Laboratory protocol should include procedures that assure that the correct specimen is collected and that the specimen is correctly labeled.• I assure the hon. Gentleman that it is a subject in which I take the keenest interest.• I assure them that both the issues mentioned by my hon. Friend will be considered at the public inquiry.• The airline has assured travellers there will be no further delays.• Cross-cultural differences are difficult to research even though anyone who works in different cultures will assure you they exist.assure somebody of something• Their guarantee assures customers of fast delivery.Origin assure (1300-1400) Old French assurer, from Medieval Latin assecurare, from Latin ad- “to” + securus “safe” 