1. making someone or something immune to a disease, typically by vaccination
Usage: present participle of immunize
2. protecting or making resistant to something harmful
Usage: figurative use

Examples

• The doctor is immunizing children against measles this week.
• Parents are immunizing their babies according to the recommended schedule.
• The clinic has been immunizing travelers before their trips abroad.
• She believes in immunizing herself against criticism by working harder.
• The company is immunizing its systems against cyber attacks.
• They are immunizing the population against the new strain of flu.