The word "蹿升" is formed by combining the character "蹿", which is a phonetic-semantic compound with the "足" radical indicating foot-based movement and "窜" providing pronunciation, meaning to leap or surge, with the character "升", a pictograph meaning to rise or ascend. Together, they create a verb where "蹿" imparts rapid, forceful motion and "升" specifies upward direction, resulting in a term meaning to skyrocket or surge upward.