assure

verbs

make certain of
"This nest egg will ensure a nice retirement for us"; "Preparation will guarantee success!"
inform positively and with certainty and confidence
"I tell you that man is a crook!"
assure somebody of the truth of something with the intention of giving the listener confidence
"I assured him that traveling to Cambodia was safe"
is derived from
is a type of (narrower)
cause somebody to adopt a certain position, belief, or course of action; twist somebody's arm
"You can't persuade me to buy this ugly vase!"
be careful or certain to do something; make certain of something
"He verified that the valves were closed"; "See that the curtains are closed"; "control the quality of the product"
cause to feel sure; give reassurance to
"The airline tried to reassure the customers that the planes were safe"
make a promise or commitment
is derived from