ensure

Verb

• 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
    

• make certain of
  • This nest egg will ensure a nice retirement for us
    
  • Preparation will guarantee success!
    

Related words

• Synonyms: 
  see , check , insure , see to it , control , ascertain , assure , guarantee , secure