plan for the worst

[Mike Hussey]

Ezra Kramer: I think if he wanted to hurt us, he could have sent the tape to CNN.
Pamela: Maybe he still will.
Ezra Kramer: My number one rule is hope for the best, plan for the worst.

What does "plan for the worst" mean?

The Bourne Ultimatum (a 2007 American action-thriller film directed by Paul Greengrass loosely based on the novel of the same name by Robert Ludlum)

 

[emsr2d2]

Make a plan for the worst situation you can imagine happening.

 

[tedmc]

Plan for the worst scenario, the worst thing that could happen.

 

[Rover_KE]

Mike, I can't help feeling there's a corresponding aphorism in Spanish and/or you haven't made much effort to grasp the meaning of it yourself before asking us.