1to avoid suffering
2to prevent (sth bad)
3to protect against (damage)
4immunity (from prosecution)
5freedom (from pain, damage etc)
6exempt from punishment
Examples
dī bà堤坝bǎo hù保护le了chéng shì城市miǎn shòu免受hóng zāi洪灾。
堤坝保护了城市免受洪灾。
The bank secured the city from a flood.
汤姆以为护身符能保护他免受伤害。
Tom thought the amulet would protect him from harm.