Meaning of “protect” - Learner’s Dictionary

protect

verb [ I, T ] uk us /prəˈtekt/

B1 to keep someone or something safe from something dangerous or bad:

It's important to protect your skin from the harmful effects of the sun.
Vitamin C may help protect against cancer.
protection uk us /prəˈtekʃən/ noun [ U ]

B2

This coat doesn't provide any protection against the rain.

(Definition of “protect” from the Cambridge Learner’s Dictionary © Cambridge University Press)