维护 wéihù to defend
to defend; to safeguard; to protect; to uphold; to maintain
How to remember 维护: 维 to preserve + 护 to defend = to defend.
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How it is used
- To safeguard / uphold / maintain - 维护权益 (wéihù quányì) protect rights, 维护和平 (wéihù hépíng) uphold peace, 系统维护 (xìtǒng wéihù) system maintenance.
- Defending/upholding something valued (rights, order, dignity), plus 'maintenance' of equipment/systems; contrast 保护 (bǎohù, protect from harm).
- Formal, civic and technical register.