verb (v)

• be careful or certain to do something; make certain of something(verb.cognition)

  Synonym:
  ascertain, assure, check, control, ensure, see, see to it
  

  source: wordnet30
• make certain of(verb.communication)

  Synonym:
  assure, ensure, guarantee, secure
  

  source: wordnet30
• protect by insurance(verb.communication)

  Synonym:
  cover, underwrite
  

  source: wordnet30
• take out insurance for(verb.possession)

  source: wordnet30
• To make sure or secure; as, to insure safety to any one.(verb)

  source: webster1913
• To underwrite; to make insurance; as, a company insures at three per cent.(verb)

  source: webster1913