n(1)拱(洞)(curved structure supporting the weight of sth above it，as under a bridge or above a door)[C]：A～es form the tops of doors，windows and gateways.拱门可作门、窗和门道的顶。The bridge had 7～es.那座桥有七个桥拱。a railway～铁路拱洞;The～of the ceiling spans 30 meters.拱形天棚跨度有30米。an old～bridge 一座旧拱桥;

(2)拱道(门)(doorway or gateway having similar structure;monument built in the way)[C](=archway)：go through the～穿过拱门;a triumphal～凯旋门;

(3)拱形物;足底弓(thing shaped like an arch，esp the middle of the bottom of the foot)[C]：the～of the heavens/the foot/the rainbow 苍穹/足弓/弯弯的彩虹;Her eyebrows have a naturally high～.她的双眉自然地高高弯起。〖同〗curve，bend，bow-shape;〖反〗straightness;

v(1)拱起(form a curved shape or line)[T+n]：(cat/person)～its/his back (猫/人)拱起背;(horse)～its neck(马)勾起脖子;〖同〗curve，bend;〖反〗 straighten;

(2)形成拱(弓)形伸过(extend in an arch across sth)[I+prep(across/over)]：The trees～ed over the path.树木成拱门状掩罩着小径。The tree/bridge～es across the river.那棵树呈弓形伸至河对岸/那座拱形桥跨越河面。〖同〗curve，bend，span