1. To provide protection, immunity—usually emo­tional.2. To inoculate against unforeseen assaults, usually from especially manipulative individuals. ...

1. Taking precautions about something, particularly one’s sex life.2. A warning to take care in a particular situation, sexual or otherwise. ...

A vaccine protects from certain diseases by introducing a small and manageable amount of the infectious agent into the system, creating an immune response that is ultimately protec...