覆盖 (fù gài) is a verb meaning 'to cover' or 'to overlay' — literally, it combines 覆 (fù), which means 'to overturn' or 'to spread over', and 盖 (gài), which means 'to cover' or 'a lid'. Together, they emphasize complete, often uniform coverage — like snow covering the ground, paint covering a wall, or vegetation blanketing a hillside. It’s commonly used in both literal and figurative contexts, especially in descriptions of natural phenomena, technology (e.g., signal coverage), geography, and data visualization.

The word implies thoroughness and continuity: something spreads across a surface without gaps. It’s more formal and precise than simpler verbs like 盖 (gài) alone and is rarely used for quick, temporary covering (e.g., throwing a blanket on someone). Coverage can be physical (snow, vines), abstract (media coverage), or technical (5G network coverage). It’s frequently found in written Chinese and formal speech, but also appears in everyday explanations of environmental or urban changes.