Definition of insure against
1 : to make (something bad) less likely to happen usually by planning and preparing Doctors recommend exercising to insure against health problems.
2 : to protect (someone) from (something bad) We can't insure our children against all life's problems.
Word by Word Definitions
Seen and Heard
What made you want to look up insure against? Please tell us where you read or heard it (including the quote, if possible).