‘战壕’ (zhàn háo) literally combines 战 (zhàn), meaning 'war' or 'battle', and 壕 (háo), meaning 'ditch' or 'moat'. Together, it refers specifically to a long, narrow ditch dug into the ground by soldiers for protection during combat — a classic feature of trench warfare, especially in World War I. It serves both defensive and tactical purposes: shielding troops from enemy fire, enabling movement under cover, and forming part of a larger fortified line.

While historically associated with early 20th-century warfare, ‘战壕’ appears in historical texts, military documentaries, war novels, and museum exhibits. It is not used for civilian ditches, construction trenches, or animal burrows — those are called 壕沟 (háo gōu) or simply 沟 (gōu). The term carries strong connotations of hardship, endurance, and frontline combat, and is rarely used metaphorically in modern spoken Chinese.