insure

verb

1. 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

2. 2

   make certain of

   This nest egg will ensure a nice retirement for us

   Preparation will guarantee success!

3. 3

   protect by insurance

   The insurance won't cover this

4. 4

   take out insurance for