verb (v)

• cause to feel sure; give reassurance to(verb.emotion)

  Example:
  The airline tried to reassure the customers that the planes were safe.
  

  Synonym:
  assure
  Antonym:
  vex, worry
  

  source: wordnet30
• give or restore confidence in; cause to feel sure or certain(verb.communication)

  Example:
  I reassured him that we were safe.
  

  source: wordnet30
• To assure anew; to restore confidence to; to free from fear or terror.(verb)

  source: webster1913