arch /ɑ:tʃ/ I. n.［c］拱，拱门，拱形(结构)：an arch bridge 拱桥；an arch roof 拱形屋顶 The bridge had 7 arches. 那桥有七个桥洞。‖II. vt.& vi. （使）成拱形：The cat arched her back in anger. 那猫怒得拱起了背。A bridge arches the canal. 一座桥横跨在运河之上。The trees arched over the path. 树枝连成拱形,遮在小路上方。