Verb
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make a promise or commitment
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cause to feel sure
give reassurance to
"The airline tried to reassure the customers that the planes were safe"
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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"
- see to it -
assure somebody of the truth of something with the intention of giving the listener confidence
"I assured him that traveling to Cambodia was safe"
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inform positively and with certainty and confidence
"I tell you that man is a crook!"
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make certain of
"This nest egg will ensure a nice retirement for us"
"Preparation will guarantee success!"