to tell someone something firmly so that they stop worrying and feel certain about it
I assured my little brother that there were no monsters under the bed.
The doctor assured the patient that she would recover quickly.
✦ from Old French assurer “to make safe,” from Latin ad- + securus “secure”.
to make certain that something will happen or be obtained; to guarantee
Regular maintenance assures the machine’s long life.
Early booking will assure you a seat by the window.
✦ extended sense of making something sure, first recorded in 16th-century English.
to insure someone’s life so that money is paid out on their death
They assured him for £250,000 before his expedition.
Many couples assure each other to protect their families.
✦ specialised financial use developed in 18th-century Britain, distinguishing life assurance from general insurance.
