What does it meaning immunize, in the dream?

Figurative of going through light hardship in order to prevent one that is devastating; see “immunize”... Dream Dictionary Unlimited

Vision: Dreaming about being vaccinated: people are dishonest and trying to make life difficult tor you—defend yourself! Watching a child being vaccinated: you are protecting a defenseless person from being attacked (with a sharp, “piercing tongue”).

Depth Psychology: The dream is a sign that you want to immunize yourself against other people’s hostilities, nastiness, and malice. These people are not important—don’t take them seriously. Besides, everyone is entitled to his own brand of meanness!... Dreamers Dictionary