Antonyms for the phrase "clambering up" include descending, walking downhill, scaling down, and descending gradually. Each of these words suggests a different method of moving downward, with descending implying a straight downward path and walking downhill suggesting a more gentle slope. Scaling down implies a more careful and deliberate descent, while descending gradually might suggest a slower, more relaxed pace. Regardless of the chosen term, each antonym for "clambering up" implies a departure from the effort and exertion required to ascend, whether that effort was physical, emotional, or intellectual in nature.