Verb
To make sure or certain; to render confident by a promise, declaration, or other evidence.
To declare to, solemnly; to assert to (any one) with the design of inspiring belief or confidence.
To confirm; to make certain or secure.
To affiance; to betroth.
To insure; to covenant to indemnify for loss, or to pay a specified sum at death. See Insure.
Source: Webster's dictionaryLet every nation know, whether it wishes us well or ill, that we shall pay any price, bear any burden, meet any hardship, support any friend, oppose any foe to assure the survival and the success of liberty. John F. Kennedy
Some people think football is a matter of life and death. I don't like that attitude. I can assure them it is much more serious than that. Bill Shankly
Stand firm in your refusal to remain conscious during algebra. In real life, I assure you, there is no such thing as algebra. Fran Lebowitz
Do not worry about your problems with mathematics, I assure you mine are far greater. Albert Einstein
I wish to assure you that there can never be any return to the state of armed conflict which existed before our commitment to peace and the democratic process of election under the Lancaster House agreement. Robert Mugabe
A losing trade, I assure you, sir; literature is a drug. (George Borrow) English Proverb