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assure (one) of

To try to convince one of something or quell one's fears. The partners are getting nervous—we need to assure them of the deal's favorable terms. Can you please assure the boss of my ability to handle this project?
See also: assure, of

assure someone of something

to guarantee something to someone; to promise someone that something will happen or that a particular state exists. I want to assure you of our good intentions. Frequently, she had to assure herself of her basic worth.
See also: assure, of
References in classic literature ?
I dwelt upon the fact that Sophy - who I do assure you, Copperfield, is the dearest girl
And I assure you I am quite sorry that they are going home on Tuesday, which is the day before the first day of Michaelmas Term.
The rest, Princess, you know; and it only remains for me to thank you for the kindness you have shown me, and to assure you of my gratitude.
I do not wish to depreciate my own palace, but I can assure you that it is very poor beside that of the King my father, as you will agree when you have been there to greet him, as I hope you will shortly do.
You will find his consequence very just and reasonable when you see him in his family, I assure you.
It's all a joke, mamma; it's just a joke like the 'poor knight' --nothing more whatever, I assure you
She is mad, insane--I assure you, she is mad," replied the prince in trembling tones, holding out both his hands mechanically towards the officer.
I could conscientiously assure Lady Montbarry that no danger was to be apprehended thus far.
Make up your mind to give us a fortnight of your time, and I can assure you that we will do our best to make yours a pleasant stay.
I can assure you that you will be welcome to come and go as though it were entirely your own.
No, no,' says she, 'I will do him no injury, I assure you, but you may let me satisfy my curiosity a little, for if it is he, I warrant you I find it out.
No, no,' says her friend, 'I can assure you Sir is no hypocrite, he is really an honest, sober gentleman, and he has certainly been robbed.
She stepped at once into the politest and best circles, and I stepped into a fortune which I assure you was very necessary to my comfort--quite indispensable.
Not in the slightest degree, I assure you,' returned his father with great composure.
If a physician of high standing, and one's own husband, assures friends and relatives that there is really nothing the matter with one but temporary nervous depression--a slight hysterical tendency--what is one to do?