维护 (wéi hù) is a transitive verb meaning 'to safeguard', 'to defend', or 'to maintain'—especially something valuable, abstract, or vulnerable. The character 维 (wéi) originally meant 'to tie up' or 'to hold together', suggesting preservation through active effort; 护 (hù) means 'to protect' or 'to guard', often implying vigilance against threats. Together, they convey sustained, intentional action to preserve integrity, rights, systems, or well-being.

This word is commonly used in formal and semi-formal contexts: protecting national sovereignty, upholding laws and regulations, maintaining social order, ensuring data security, or preserving public health standards. It appears frequently in official documents, news reports, policy statements, and professional discussions—but rarely in casual speech. While it can describe physical protection (e.g., guarding equipment), its most typical uses involve intangible assets: principles, relationships, rights, environments, or institutional functions.