reassure

verb

1. (transitive)To assure anew; to restore confidence to; to free from fear or self-doubt.

   “The boy's mother reassured him that there was no monster hiding under the bed.”

   “What is more, I call upon the greater part of you as witnesses to my statement, and I appeal to all of you who have ever listened to me talking (and there are a great many to whom this applies) to reassure one another on this point.”

   “"Taiwanese are very enthusiastic and love freedom and democracy, so many good international friends have come to Taiwan to support us. This is a normal and good thing, but China threatens and intimidates Taiwan," she said. "However, I would like to reassure everyone that both our government and the military are prepared, and I will definitely take care of Taiwan."”

2. (transitive)To reinsure.