definition of
insure

[1] #1 insure v. [see, check, see to it, ensure, control, ascertain, assure] 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". wn

[2] #2 insure v. [guarantee, ensure, assure, secure] make certain of; "This nest egg will ensure a nice retirement for us"; "Preparation will guarantee success!". wn

[3] #3 insure v. [cover, underwrite] protect by insurance; "The insurance won't cover this". wn

[4] #4 insure v. take out insurance for. wn