Climb  —v. 1 (often foll. By up) ascend, mount, go or come up. 2 grow up a wall etc. By clinging or twining. 3 progress, esp. In social rank. —n. 1 ascent by climbing. 2 hill etc. Climbed or to be climbed.  climb down 1 descend, esp. Using hands. 2 withdraw from a stance taken up in an argument etc.  climber n. [old english]