insure meaning and definition

INSURE verb

Definition of insure (verb)

1. 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"
   • synonyms: ascertain, assure, check, control, ensure, see, see to it
2. make certain of
   • "This nest egg will ensure a nice retirement for us"; "Preparation will guarantee success!"
   • synonyms: assure, ensure, guarantee, secure
3. protect by insurance
   • "The insurance won't cover this"
   • synonyms: cover, underwrite
4. take out insurance for