n (1)梯子(framework with rungs for climb-ing)[C]：put up/set up a～架起梯子;ascend/climb/go up/get up/mount a～爬上梯子;come down/descend a～从梯子上下来; steady a～稳固梯子;lean/place/rest a～against a wall 把椅子靠在墙上;an aerial/accommodation～天/舷梯; a rope～ 绳梯;get one's foot on the～开始，着手;kick away(down)the～(by which one rose) 过河拆桥，忘恩负义;

(2)上升的途径，阶梯(means of rising)[C](fig)：Hard work is often a～to fame/success. 发奋工作常是通向成名/成功的阶梯。

(3)等级(rising series of levels)[U，the～]：the bottom rung of the social～社会的最低层;

(4)跳丝(a long，narrow flaw caused by the breaking of a stitch in a stocking or other knitted fabric)[C](=AmE run)：get/have a～in a stocking 长筒袜跳了一根丝;

v(使)跳(抽)丝((cause) to develop a ladder(4))[T+n，I]：I've～ed my tights. 我的紧身衣抽丝了。Stockings～easily. 长筒袜很容易跳丝。