横卧 (héng wò) is a descriptive verb meaning 'to lie horizontally' or 'to stretch across' — literally combining 横 (héng), meaning 'horizontal', 'across', or 'sideways', and 卧 (wò), meaning 'to lie down' or 'to recline'. Together, they evoke an image of something long and steady lying flat and broad across a surface or space, often suggesting stillness, dominance, or natural grandeur.

This word is commonly used in literary, descriptive, or geographical contexts — especially when portraying mountains, rivers, bridges, ruins, or even animals resting in a wide, extended posture. It carries a slightly formal or poetic tone and is rarely used for casual human lying down (e.g., you wouldn’t say someone ‘横卧’ on a couch; use 躺 instead). It emphasizes orientation and spatial presence rather than mere posture.